Something else to remember, the wire is a grounding circuit coming from the gage. The "Tan" wire is ground that runs through the sender and back out to the frame. The sender just varies the amount of ground so the gage will move depending on the amount of resistance. So if your bed,cab and frame are not well grounded, your gage can not work correctly. Runs some good quality ground wires from the sender to the bed, from the bed to the frame, and from frame to the cab. Don't forget about from battery to frame. Also, clean each spot of all rust and paint, and use Star washers under each wire connector.
You can never have to may ground wires! Joe
