Hey guys. I have never done one before, but I have seen quite a few being installed. There is about 10-15 wires that have to be either spliced into or cut and routed through the Auto-Starter itself, depending on if you want your factory security (panic Button) and power locks to work through the Auto-starters remote. Where i work we have a guy come around who does all of our installs. When you buy the auto-starter you acutally dont get all that you need to put them in your vehicle. You actually need what called an Interface Module. It communicates with your cars computer to "trick" it into thinking the key is in the ignition. Here is the kind of starters we sell At Canadian Tire here in Canada.

ProStart | ProGuard - Remote Control Car Starters and Alarms

Interface Module

The second link is where i did just a general search for and interface module for a GP. Imhaving some trouble finding the site where you can actually order the modules, but if memory serves they are about another 50 dollars for the module. (I believe the module will come with a wiring diagram as well)

I am just familiar with these kits here. There may be some out there that you will not need a module to install them. I would like to hear about them if there is!