Hondata

So your saying you used a hiring harness just to plug into the old wires? That's what I understand you saying. Thanks

I have an 89 prelude with a jdm b20a but i believe it still has the US ecu. I think the ecu is OBD0 but i'm not for sure and i know i have to have at least and OBD1 for an s200 system. What kind of things do I need to do in order to upgrade, and I just get a harness to plug the obd1 into the obd0 ...