You can use ur auto ecu if u wanna be cheap it wont run right but itl run i did the same shit in my hatch i took out a blown d15 90 civic -to a d15b7(92-95),the harness from the auto matic harness is fine but ir ur runnin a mpfi throttle bottle gotta get a SI wire harness.if u decide to use your auto harness there's going to be a plug on the rear of your block under your throttle alittle more to the left of the middle lol..i also did the auto to manual swapp also and it came outtt pefect make sure u dontt do any shortcuts..pedal's wern't bad as i thought it would be,drop ur sterring column.. dont try and squeez it in there it could bend...ur welcome..