Check under the hood of your truck, near the brake master cylinder and hood hinge. See if there are 4 cut wires with black plastic tips just lying there. If so, those are installed for just your needs. If so, they terminate behind your fuse panel, under the steering wheel. That comes out with 10mm socket. drop the fuse box, and you'll see the other end of the wires. The Super Duty trucks have these wires.