Deviant117

I know with a dsm you can use an ecu from a manual trans in a dsm with an automatic and vice versa. I'm doing a mini-me swap, d16y7 block with a z6 head. Wondering if I can use a P28 ecu for a manual trans in my automatic 99 civic dx.

94EG8

Nope, can't use any P28 with your setup actually. OBD1 ECU wont control the OBD2 tranny, even if it was an automatic ECU.

Deviant117

I can't use a P28 with an obd2 to obd1 conversion harness?

94EG8

Not with an automatic. You can either swap in manual trans (recommended), run an automatic P2P and accept the fact that it will never run right due to timing differences, or run a Y8 head and automatic P2P.