Electrical V8 Swap Wiring Questions.. Help

I don't believe the 90 engine harness will work with the 93 body/dash harness. Easiest thing to do would be to source a 92/3 engine and maf harness. No splicing or integrating needed.

Nope... The 93 was a unique one. One of the changes was the fuel pump relay moved from under the seat to near the airbox. Wiring harness in the dash is different & wiring harness in the doors is different.

I'm actually doing something similar minus the 4 cy. I have a 91 im converting over to a 93.

To use a 93 harness you have to change all the wiring over to a 93. Time consuming but its do-able. If you have the option, other years are more flexible than the 93.

Edit: Also, 93 used a different latch mechanism for the rear hatch so you need that and the catch stud as well.

The 93 used the A3M ECU for the 5 spd.

On the hatch I think i'm wrong. I have a 89, 91 & a 93. The 93 actuator is different but functions the same as the others. The wiring pigtails on the inside driver quarter, where it connects to the harness, are the same.

The door harnesses are different on the inside of the door where it connects to the power window switches but if you use a entire door, the connectors that connect the door to the harness on the inside by the kick panels are the same.

Honestly its safer to just use the whole thing from whatever year you want to go with.