I dropped my D16y8 98 Si(EX in US) motor & ECU in a 98 hatch that I gutted. It had a B18b & was previously converted to OBD 1. I have no wiring experience & don't know what the previous owner did with all the cabin wiring. Can I plug in my C02s (secondary 02 sensor on CAT) with a sub harness?, or do I have to rip apart the dash & rewire the main harness to accept the 02. I'd like the car as close to stock as possible, it would be nice if I could just plug it in under the dash like the Si. Is the main wiring under both dashes supposed to be the same?, or was the hatch wiring tampered with to accomadate the OBD 1 conversion? PLEASE shine light, what's my best easiest option.