Power to the Interceptor is provided in the harness itself, NOT the red wire which only controls converter delay lockup on UPSHIFTS. Downshifts have no delay or adjustability and are controlled by throttle input. Line pressure is variable depending on throttle position and gear so it would be difficult to take over control from the ECU. Hook a pressure gauge up to your tranny and watch it as you drive for more info on what is going on.