I used a 1995 harness and computer on my swap. The 93-95 harness is OBD-1 and a lot easier to work with. On the OBD-1 harness, once you strip away the lighting and starting wiring you're basically left with a self-contained engine harness that only needs two or three wires hooked up to make the engine run. With the OBD-2 harness you have lighting and all kinds of other stuff all integrated into the ECU and it's a rats nest in comparison. IIRC if the OBD-2 ecu doesn't detect the transmission it will pull timing and cut fuel at high rpm.