I have a 86 K5 with all options, and I bought the Painless kit for chevy trucks from 73-86. First off it is a little price at $486 from autozone, which is the cheapest I found it. The kit was the 18 circuit type. Well painless it is not, but it does have most of the stuff you need for a rewire. THe only thing that it really totally leaves out is a provision for the electric rear window, knock sensor, and the second oil pressure gauge( mine has two for some reason). It also leaves out the wiring to the four wheel drive lights and the A/C lights. These are the lights that come on with the head lights and light up these devices at night. Thats not that big of a deal becasue they have extra accessory wires that you can hook these into. THe fourwheel drive indicator light is fun to get working, you basically have to take up the carpet and figure out what wire is the power wire and which is the ground and stuff like that. It does have the provision for the four wheel drive indicator on the gauge panel, but not all the wiring that goes to the unit in the transfer case. I figured this all out, and the most complex thing I wired before this was the stereo and Amp. The kit does add in some stuff that is not on factory trucks like power for: electric cooling fans, electric fuel pumps, and ,something mine didn't have, power for a fuel tank switch. All in all it is a pretty close setup fora complete system, but it is not entirely complete. I persoanlly would not do this project if you have the option not too. Mine cuaght fire and fried the wires so I had too. If you're knowledgeable about electical stuff its not that bad, just a pain in the butt. IF you don't know much about this stuff, then don't try it. It took me about two weeks of working time to fiure it all out. If any body has any specific questions PM me and I'll do my best to explain. Good luck to all those that do a rewire.