Ok, so my friend has a 91 hatch. It was originally obd0 obviously but it was swapped to obd1. However, they left the dpfi on it being morons and now want to go b18a1 obd1 for serious tuning purposes. My question is since the car is technically obd1, what needs done wiring wise to swap a b18a1 into it. Someone said a b series obd1 harness will do it but I don't see how. It can't be that easy.