Here is what i have: I have a 1994 Del Sol and i am putting a b18b OBD2 LS motor from a (2001 Integra i think) i have both of the ECUs i have a obd2 b18b ECU and i also have the OBD1 LS ecu. Right now i have the OBD2 harness on the motor and it plugs straight up into the Del SOl harness but when i plug the OBD1 LS ECU the car does not start.

what do i need to do for it to work properly? do i buy the obd2b to obd1 harness or do i switch the engine harnes to OBD1? any help is apreciated. thanks