Derek Greenwood
Daily Driver
I am hooking up an MSD tach adapter in my Scorp. The tach hasn't been hooked up in 18+ years. I need to know if the tach wire normally got connected to the positive or negative terminal on the coil. Per MSD if it connected to the positive it is a current triggered tach. If it connected to the negative it is a voltage triggered tach. The wiring is different based on the type.