I've had my st215 engine running in my st165 for over a year. When I did the swap I didn't install the AC. Now I want to put it in cause it's getting hot. I have almost everything figured as far as wiring. My only question is with the ECU. The st165 ECU had one pin that had something to do with the compressor clutch. The st215 ECU has two pins that go directly to the AC computer. Can I just wire it as was done originally in the st165 and not worry about the ECU? Or does anyone know to include the new ECU?