I have 6th gen Civic Hatchback, OBD2 (year '97). Now, the problem is engine is 1.4 (D14A4), and ECU is P3Y (same wiring as P2K). I hear you: why not just OBD2->1 conversion harness? Reason: My ECU has only 2 plugs. They look like OBD1, but are OBD2, and to add - it even fires injectors in pairs (1+4, 2+3) - only two wires go out of ECU for injectors. So, most of plugs are 'unusable'. What I was planning is to get complete OBD1 wire harness, and replace existing. How big of a problem will that be? - I plan to put OBD1 engine (B16A2) aswell to get along with that. What I'm worried if there will be other possible problems?