Some background knowledge is this: 89 CRX HF/B18a1 swap. I want to change my CRX over from OBD0 to OBD1, because of the advantages from a tuning and Hondata standpoint, but I have very little knowledge about this. Is it basically the same as going from OBD1 to OBD0(but vice-versa), because I had to do that with my motor that is in the car now. I was wondering first off what all is needed... My guess is: ECU, Harness, Dizzy, Injectors and Four wire O2 sensor. But I think I am missing things. And second, do I need to do anything else, besides swapping out the necessary parts, like adding wires for anything besides the O2, bridging anything in the ECU or shit like that. If someone could help me out a bit, I would like to jump on this. The only things that I need(according to my list) is an ECU and O2. So.... Let me know. Thanks guys.