i have a 88 hf with a 90 civic si motor/tranny/ecu/etc. what wiring do i need to do?

 

its all the same. Take off your old harness put it on your new motor. Then plug in your new ecu, and your good to go.

 

If its your first swap, then you'll notice its a tight fit in some places for the wiring. It does fit though, like stated above.
Easiest way to do it, is to pull the stock motor with the wiring still on it, just dissconnect the harness on each shock tower. then sit the two motors side by side and switch it over while its out of the car.

 

there was an extra plug on the back of the b18a block that the crx harness didnt have what should i do about it?