I installed a backup camera above the license plate on my silverado. It displays on the factory nav system, had to pay chevy $150 to reprogram the nav system. I installed a device called a GM Unlocker. The Unlocker switches to rear camera when the truck is shifted to reverse, the turn sugnals are turned on or the window lock button is pressed 4 times and stays on rear camera until the mute button on the steering wheel is pressed 2 times, turn signals turned off or shifted out or reverse. After I got my TT I installed a camera in the spare tire cover. The TT camera goes through the GM unlocker and functions the same as the truck camera. Both cameras plug into a A/B switch under the dash. This lets me select which camera I want to see. This is great when hitching up, changing lanes and backing. I got both cameras and the GM Unlocker off ebay.
2010 Rockwood 2604SS
2008 Silverado 1500 LTZ 4X4
Great Wife and Idiot Yorkie
True Friends are like diamonds, precious and rare.
False ones like autumn leaves found everywhere