Hi there Arnout, I have built an a650e into my mk1 cortina, also using an aftermarket TCU.. Have you been able to figure out how the solenoids work?
The info I have on that box is as follows:
gear 1: Solenoid 1
gear 2: solenoid 1 + solenoid 2
gear 3: solenoid 2
gear 4: solenoid 3
gear...