When putting a GSR motor in a 92 Civic VX, Can I just remove the old engine wiring harness and plug the new GSR wiring directly to the civic main harness and then plug in the GSR ecm? Will every thing match up this way?

 

ya they will, but you will need to add the secondary butterflies to A17 if you are doing OBD1 and Knock sensor to D6.

This would also apply if you are using a P72