Right so I need to get the RPM signal for the coil. It says use the negative of the coil.
I don't know how it's confusing me but it's a 3pin plug you have a 12v feed to the coil (black wire), an ECU trigger wire (black and green wire) and a ground (brown wire).
If I went straight to the ground wire I can't see it getting an RPM signal. So I'm guessing I need to go onto the black and green wire that is the ECU signal wire so I grounds when the ECU tells it to so it will give you the RPM signal?
Can anyone point me the right way?
Thanks