Have just replaced my speedometer on my trusty 2011 G5 with a digital instrument which includes a tachometer. Having connected all the usable components I find the tachometer when connected to the HT coil to provide a pulse reads at half speed. Question: does the crank position sensor give just one pulse per revolution and would it be safe to splice into the line and which colour wire? I see on the wiring diagram for the new Continental GT it's tacho is connected to the crank sensor. Thanks folks.