5v for vss, crank , all sensors will come from your MS harness. i ripped ALL the harness out, it goes all the way up to under the center console. The starter "trigger" wire will need to be ran incabin and hooked to the starter wire. you need to do your own relays, i have one for the ms, fuel pump , and another for the alt. of course i have +12v power for other things comeing from them as well like 12v for fans, injectors etc. Run all the grounds to one place. other then that it wasnt to bad as i look back lol, but it is a little scary..if you have the time, and dont need the car for a bit, do it like how clean it is, im even going to clean it up mor this winter, but i think its worth it