Project86- My first (and probably not the last) Rebuild

[project86]

k so im gettin the interior done before i do the door jams so i dont fuck them up tryin to do it later.... so the whole inside of the car is stripped right now except the front carpet piece. im still tryin to get it out. as far as the inner wiring goes, how much of that do i actually need... i dont use my ac because it doest work. im going to use the a racepak digital display for my gauges. Can i get rid of any of it at all or should i just not worry about it? also im going to be puttin a dash in that is from a s5 car. my concern with this is that while the connectors may all match up im worried about the wires inside the connectors being diff. case in point.. i tried to use a headlight switch from a s5 car with my s4 headlight harness and the headlight worked in the opposite way (down being up and up being down) i could hear the relays making funny noises and then i smelled buring. anyone have some input?