So I just splice it in with the wire ay conector 3?
Or do what i do on mine.
Dont cut the original VW harness, if you whant to get back your old setting or sell the car, better to have thier original setting.
like i (crude) draw, you put 2 wires in a male connector, plug it in the female original VW connector #3, and you plug both wire on the fuel cutoff solenoid(original plug #3) and on the timing advance solenoid(original plug #4). Leave the number 4 plug alone with some tape on it to avoid shorting.
If you have any question ask me. (Humm, i'm french, so sorry for my poor english.)