Since Vault City and Gecko are inextricably linked via the quests that you have to perform for both of them I will do them together.

Help out Joshua part 1

You will arrive in the courtyard of Vault City where the people that aren't citizens get to live. Head over to the greeting office which is right inside the gate, check out the lockers and desks there for some stuff. Leave that building and check out the tent to the northwest. There is a woman there who needs help freeing her husband from inside of Vault City. Tell her that you will help her out.

Find Doll and Get Wrench

There is a child standing outside of the tent near the barwho has lost her doll. The doll is located behind the building that houses the bar, it looks like a box. Give the doll to the girl and watch what she says, after a while she should indicate that she has hidden a wrench under some rocks behind the bar. Check out the pile of rocks and you will find the wrench.

Get Cassidy

Head into the bar and talk to the bartender Cassidy, you can get him to join up with you and you would be well advised to take him along. Cassidy is one of the better NPC's that you will find, just don't give him any drugs at all as he has a heart problem.

Fix Autodoc

Check out the clinic building to the northwest of the bar where you will find the doctor, once you find out about dermal implants you come here to get them done. You should fix the autodoc if you have the repair skill to do it at this time, if not just come back later.

Cure Sick Charlie

To the south of the doc is a tent that has a man lying on the ground in it. If you use your doctor skill on him you can diagnose his condition, he has rad poisoning. Give him one dose of Rad-Away and that should gain you some xp for helping him out.

Get Plow for the Smiths

To the east of the clinic is a tent where you will find the Smith family. If you can get a plow from Harry on the other side of town for the Smiths you will gain some xp and a Desert Eagle from Mr. Smith. You just need to buy the plow from Harry he is on the west side of the town, if your Barter skill is good you can bargain the price of the plow down.

Talk to Vic's Friend

Head to the shack just north of the cage on the west side of town. He will give you the locations of Broken Hills, New Reno and NCR. If Vic is with you there is some extra dialogue.

Get False Citizenship Papers or Day Pass

Head to the north and into the next area. Go into the building to the east in front of the main gate. You can either get a Day Pass from the guy in the back room to get into the city or a better way to do things would be to get some false citizenship papers from Skeev the guy in the room out front. Talk to Skeev and he will set you up with the papers for a price. You can use the citizenship papers to pose as a citizen which allows you to go into Vault City at night and also allows you to use the all of the Amenities shops. The only limitations are that you should not meet up with Sergeant Stark at night and you can't get into the vault. Once you get your way in you should head inside Vault City.

Get Val some tools

Head to northeast and in the Maintenance building on the corner you will find Val, if Vic is with you you will get some interesting dialogue between the two of them. Otherwise you can offer to help Val out by getting her a pliers tool and a wrench. You should have acquired the pliers by now as well as the wrench, give them to her and then come back later to claim your reward which is a Super Tool Kit.

Get some books

Head over to the Information Center it is to the north of the entrance the second building on the left. Talk about books with Chief Librarian Kohl there and he should be willing to give some up to you for free if you show how much you really like them.

Help out Joshua part 2

The woman at the beginning is looking to get back her husband. He is Joshua and he is being held at the Servant Allocation Center to the east of the Information Center, if fork over some cash to Barkus the man holding him he will release him. Depending on your Barter skill you might be able to bargain him down.

Council Area

Head north to the council area in the southwest corner you will find the Parlor in a room to the south inside that building there are some things to be had in a desk and a bookcase.

Talk to the First Citizen

Head to the large building in the north and then go to the room in the southeast corner to talk to the First Citizen. Tell her that you are a descendent of the original Vault Dweller and show her your uniform, watch out she is a bit touchy. She will offer you a quest to "take care" of the problem at Gecko. Offer to help.

Talk to Senior Council Member Mclure

Mclure is on the far west side of the council building. Talk to him about Gecko and the Raiders. You can also try and take the citizenship test that is offered by the man in the room in the north of the building, but unless you are superman you won't pass.

Sergeant Stark

On your way out to Gecko you should stop by the Corrections Center it is right outside the Vault which is on the east side of the south part of the city. He will tell you about the Raiders and give you a mission to scout around Gecko for him. Take him up on this. Then head over to Gecko, on your way make sure to walk through all the squares around Gecko to complete the mission.

Gecko Manager's Office

When you get to Gecko you should head to the Manager's Office to the north of the entrance. There you will find Harold, still alive and kicking from the first game. He will give you the lowdown on Gecko and that they need a Hydro Electric Magnetosphere to make their power plant work properly. Head back to Vault City.

Vault City First Citizen and Mclure and Super Tool Kit

Talk to the First Citizen and let her know what needs to be done to fix the power plant. She will tell you that she wants the Gecko mutants "taken care of" not their power plant fixed. Be sure not to argue her decision, be careful with this conversation, save before you talk to her as if you make her too mad she kicks you out of Vault City for good. After you talk with her go talk to Mclure let him know about Gecko and he will tell you where to get the part. He will also tell you that he will give you your citizenship despite what the First Citizen wants. Go get the part and after you get it go over to Maintenance and get the Super Tool Kit from Val, you did give her the tool and wrench right?

Gecko Managers Office and Reactor

Go to the manager's office and get the part requisition form from the desk behind Harold. You can also get the coolant report, but that is only necessary if you want to destroy the plant, I'm assuming you won't do this.

Go inside the plant on the east side of town. Talk to the ghoul behind the counter and he will tell you where everything is located in the plant. Head through the door to the north and then go into the door second from the left. There you will find Jeremy. Give him the part requisition form to get the Three Stage Plasma transformer for later. Then go down the hall to the east and get the yellow pass key out of the locker in a room down there. In the next room to the east there is a blue pass key in the bookcase there.

Head south and east to the door leading to the reactor. The first locked door will take the yellow pass key to open, just use the key on the door. Once you are through that first locked door go through the door to the east and in a room to the north you will find a bookcase with the red pass key in it.

Go south and east to the far east side of the plant and talk to Festus in the room in the southeast corner. If you do not have a high speech skill, he will not be much help and you will have to take care of business on your own. If you do have a high enough speech skill (not sure what skill level you need), you can convince him to help you out by encouraging him and avoiding the negative dialogue options. Thanks to Thomas for that tidbit.

If you end up having to do it yourself then go north and west and then north using the red pass key on the locked door. Once you are at the reactor controls talk to Hank the glowing ghoul in front of the control panel. If you have the coolant report and you want to destroy Gecko you can give it to Hank and he will turn off the coolant, you should not do this if you want to keep Gecko alive! Talk to Hank about the core, he will mention the robot. Use the terminal behind Hank to control the robot. Log onto the terminal and choose the first option then choose the option to use the robot. It presents you with the activation codes. Enter the codes in this order, A1546761; 5B576005; 35C76863. Then you will have to manually enter the procedures to install the new part once you select the correct option, try them all out, if your Science skill is good enough you could find some interesting things. The order that the commands are entered once you get into the programming mode is, Amplify Plutonium Gamma Shield; Deharmonize Neptunium Impeller; Calibrate Uranium Rod Driver; Set Voltage For Saturn Class Capacitor; Test Jupiter Wave Compiler. You can figure this out by looking at the parts of the reactor and seeing what order they are laid out in around the reactor. Execute the program and once the robot returns you can then enter the final command to install the new part, don't turn off the coolant valve! You can also put the part in yourself by going into the reactor and taking damage, but you get more XP using the robot.

Talk to Festus again and he will let you know the reactor needs to be optimized for peak performance. Offer to help out and he will give you a data disk that you will need to put data onto from the computers in the vault in Vault City.

Gecko North Side/Junkyard-Car Part!

Head north after you get out of the reactor into the junkyard north of Gecko. Talk to Percy in the Survival Gear Locker to the west, he will tell you about his friend Woody that got lost in the Den. You will find out about him later. There is a first aid book in the building to the east of the shop in a bookcase.

In the building to the northeast of Percy's shop you will find Skeeter. Give him the Three Stage Plasma Transformer you got from Jeremy and he will offer to upgrade one of your weapons for free. Ask Skeeter about a battery for a car and he will tell you about the Fuel Cell Regulator that he has. If you give him the Super Tool Kit that you got from Val he will give you the part. This is all you need to get the car running, well you will also need 2000 gold to give to Smitty for the car.

In front of the broken reactor you will find a building where Gordon of Gecko is hanging out, if you have ever seen the movie Wall Street, he is a hoot. Also you should get the Cheesy Poofs that are in either the locker or the desk in his shack.

To the west of the reactor there is a building head around the top to the northeast corner of that building and go inside, there you will find a ladder leading down. Once you are down there head to the south east around the corner and talk to the giant mole rat down there. Give him some Cheesy Poofs and he should give you a talisman that makes you a member of his cult and he will tell you about his plan to take over the world. I don't know what purpose this serves although it did give me and option to kill him that I did not take. If anyone has anything more about the rat to tell me I would be interested. Anyway, you can now head back to Vault City.

Vault City...AGAIN!

Go back and talk to Mclure and he will give you your citizenship papers when you tell him that you have fixed the Gecko reactor. Then you can gloat a little to the First Citizen, not too much as she might get too bitchy though. Make sure to check out all the Amenities offices in the city for neat stuff. Then head into the Vault.

The Vault

Vault City's vault has some interesting things inside of it. On the first level you can talk to the doctor and his assistant. If you pursue your line of questioning long enough with the assistant you can offer to give a "sample" to the Vault City genetic pool. If your doctor skill is at least 75 you can get information from the doctor about implants. Also you can use the computer behind the assistant if your Science is very high to get some interesting information. You will probably need to come back later to complete those quests though.

Go to the second floor and pick the locks on all the doors that you can, notice that the all the boxes contain large amounts of water chips, the irony is thick from the first game. The water chips are worthless so don't bother taking them. Check out the footlockers for the good stuff. Also if your Strength is high enough you can force open the jammed doors or take some Buffout and open them for more stuff. I think you probably need a 10 Strength or so to open the doors. One of the footlockers in one of the locked rooms has a wrench and tool in it, so if you were unable to find one or the other there you go. Also one of the jammed rooms has a chip in it that will raise one of your stats if used in a machine later in the game.

Go to the third floor. Go to the southwest and use the computer in that room in the southeast corner for some XP. Then head to the east and talk to Martin, he will tell you where the main computer is located. Go to the computer which is the only one that is talking and get the optimization data from it.

Back to Gecko

Head back to Gecko and the reactor and use the newly optimized disk on the reactor computer where you controlled the robot. Festus will tell you to do this if you talk to him.

Get the Car at the Den also finish the Woody quest

While this is not exactly part of Vault City and Gecko it is related. Head back to the Den and go to Smitty in the west side of town. Make sure you have 2000 gold before going there. Give him the 2000 and the part and he will fix the car up for you. You can then have him install the other part that you got from Klamath which will help with fuel economy, this will cost 750. I found that I could barter with Smitty to get some of my money back, I suppose you could steal it from him too. I would also barter with him for the energy cells that he has on him so that you can use them to fuel the car when it runs low.

Smitty fuels the car up for you when he gives it to you, but if you want to fuel it later you will need to use either the Small Energy Cells or the Micro Fusion Cells on the hood of the car. Just click and hold on the hood until a menu pops up, then click on the backpack icon, then click on the appropriate cell in your inventory and voila!

Head to where the building next to the Brotherhood building on the west side and get the guy in the building with the coffin to show you the "Mummy." When he opens the coffin you will notice that it is Woody inside there and the quest is solved.

Next would have been Broken Hills if I hadn't lost interest in doing this walkthrough sometime in 1999. Sorry.