Swapping J-spec B18c5 Into 5th Gen Civic

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Senior Member
I am swapping a '97 J-spec B18C5 into a 5th Gen civic. I have researched every detail and know almost everything about the swap and what i need. I know i need a wiring harness to go from OBD2 to OBD1. I have the ECU that came with the motor. What i dont understand is how that works. Do i put in the B18C5 ECU into the car and THEN put the wiring harness on or what? Anyone that can shed some light on this would be a great help, thanks.