These are the wires for the inductive crank pickup. I am using a duel sync distributor so I know I need to hook the red and black together but, I am wondering if I ground only the uncoated wire or the uncoated and the wire with the clear coating(looks gray in the picture). The wiring diagram only shows the red and black. I called Comp and whoever I talked to had no idea there is 4 wires here. Any help is greatly appreciated.