Ok, I have looked EVERYWHERE and found only minimal information, and non specific to what I am looking for. I have 3 main questions, and please feel free to elaborate on them as much as possible. A brief overview: Original Equipment: 97 Honda Accord LX 4 Door. Purchased parts: B18B1 (Japanese Version) with harness (looks modular and was on engine from the crate) and manual transmission. It also came with P75 ECU. 1. I bought a 97 2 door Viciv EX harness. My is a 97 4 door. Will that matter? 2. It is an automatic to manual conversion. The engine is installed, but none of the harnesses installed ON THE ENGINE fit into the existing harness. Does the harness that came installed on the engine need to be removed and replaced with the EX harness? Is that what is meant by Plug and Play? 3. Upon inspecting the EX harness (in car ECU side) has 3 plugs, only one fits into the P75 ECU. Was I sold the wrong harness? Our biggest problem right now is the fact that this wiring is hanging us up. We already have the engine, transmission, hydraulic clutch, cables, fuel line, EVERYTHING is ready to go once this wiring issue is solved or explained. PLEASE HELP! I am so lost, an I have done my research.