Use the provided cutout template to mark an area on your dash. After making an opening for the tri-fitter switch it easily mounts using screws. Then use the F150LEDs custom harness connectors to connect up to three LED bar harness. Connect the red and black wires from your first harness to the red and black of the tri fitter switch. Then you only need the single additional wire from the LED bar harness to go directly to the switch you would like to use on the Tri-fitter panel.