Cougs, I did the Chevy Duty harness on mine and it was pretty easy. I started by snaking it through to the dash from the engine side of the firewall, then did the part that goes down to the brake switch and under the cab, then the headlight and engine bay stuff, followed by the little harness that goes from the distributor to the ignition switch. The Chevy duty harness is pretty well labeled but you do have to cut your own wires for the tail lights. It does come with turn signal wires already in.
