I have a push button on my 78. Key unlocks everything, (ignition) sends power to the neutral switch, which sends power to the push button. I then push the button to power the starter solenoid.

Very simple. I hide the button in the ash tray, should confuse any car theaf.

I did it cause there is something wrong with the key switch. This worked and seems kinda cool.

 

Well there are three reasons. One(The Obvious): Beacause it's cool, Two: Because when you got the car your key switch was messed up or wouldn't unlock your key without a seperate ignition shutoff switch(which was what was wrong with mine. I couldn't get the key back outta the ignition without a seperate shutoff switch so I just finished it), and Three: It is a type of Anti Theft setup! If you hide the switch you can't start it even if you have the key.

Mine was right there on the dash though. It wasn't hidden. But I'm thinkin about doing another setup and hiding the switch. I just haven't decided yet.

 

^ One: Ok, cool...as long as somebody else sees it...and is impressed by it.
Two: If your key is messed up, you still have to bypass the VATS.
I don't get what you're saying "I couldn't get the key back outta the ignition without a seperate shutoff switch". Was your key always stuck in the ignition, so you needed to have a hidden starter button?
Three: I've done exactly the opposite before; hidden a switch that disables the starting mechanism. This way hides a switch that works the starting mechanism.

 

So your just backwards (Camaro69)
I spent hours trying to figure out why my purple ignition wire was hot when the ket was on and cold when the ignition was turned to start. There wasnt a single wire that was hot when the key was set to start. Several manuals told me the purple wire went to the starter.

Ya well, that purple wire would have made my starter turn whenever the key was on.
That simple wont work. I got feed up after a full day and put in the push button. Never gone back. It works great and will make the car hard to steal since my button is hidden. It also confused the tech at the track.

I have been told since that my key switch is bad and causing the purple wire to be hot at the wrong position. Was a GM tech that told me. But why mess with it if it isnt broken.

 

so the purple wire is the wire that i need to put the switch on

and yes im doing this as an anti theft and to look cool im going to hide an arming switch and them have a starting switch

 

check on your model, you are a lot newer then I am. You need to put the switch on the small wire coming off of the starter solenoid. In 78 it was purple.

All it takes to turn the car over is the get 12 volts to the starter solenoid, just remove the wire that is there now. then add a new wire coming from you fuse box, to your switch to the starter solenoid. Make certain you use a momentary contact switch. I got mine from advanced for like $4

 

where is the starter solenoid on my 95

 

hmm, should still be on the top of the starter. Hopefull on of the 3-gen guys will speak up. I don't believe Chevy has ever moved the solenoid.

 

Yes, the solenoid is on the starter.
That also happens to be the wire that I would splice a switch into to break the connection and keep it from cranking over.

 

And if you're really looking for the "cool" factor: http://www.automobile-security.com/products.htm