Im swapping all my old 87 TII equipmenty into my newly acquired 88 n/a, what part of the wiring harness needs to be chaNGED? The part coming out the driver side of firewall just connects to light s and such, the paRT coming out of passenger side goes to motor...is that the only part that needs changing?? if not, plz give me some details

 

www.rotaryresurrection.com under the tech section...you can keep the drivers side harness with minor wire extened I believe.

 

Since you still have the S4...the ECU shouldn't change..and you should be able to keep your interior harness. When I did my conversion, I had to change every harness since I went from S4 to S5...the motor harness is the most important, there will be a few little plugs left over under the dash from the factory boost guage, so you may run into a small issue there..but again..its not important.