Obd2a gsr obd2b ek

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Thank you guys for looking and hope someone can help, got a 99ek coupe 5speed. Motor blew so I got a B18C1 supercharged swap with p72 ecu. No wire harness at all for either, I was looking on rywire and so confused on what I need to get. I'm so lost and read so many threads and post I just don't know what to do at this point.. please someone help me out. If I gotta switch it to obd1 what all needs to be changed? So frustrated and irritated, but I don't wanna give up on this 😫