I'm looking to convert an '89 4.0 XJ to a 5 speed using a '90 4.0 5 speed donor car (AX-15).
Do I have to put the whole '90 wiring harness in the '89, or can I just swap the computer, TPS, trans, and pedals/hydraulic clutch parts, clutch, flywheel and pressure plate from the '90 over the the...