I am currently installing a new engine. My car is a 1992 325i and I bought a 93 engine. The guy from the salvage yard said it would work on my car. The 93 engine came with a wiring harness but it is different from my car's harness. On my car there is a big rectangle plug that goes to the ECU. On the new engines harness there are two big rectangle plugs that I think go to the ECU and some more extra wires. Do I need a 93 ECU or will the new engine work with my old harness thanks.