I just bought a 2007 Tundra Limited without the back-up camera. I am trying to add one. I see the 4 prong wiring plug under the bed, and I took the overhead console off the roof of the cab and found a plug up there. Can anyone confirm that those are the 2 plugs, and provide a wiring diagram showing what the wires are? I would prefer to plug into the existing wiring rather than run external wire. Thanks.