I would like to upgrade my GP3 without a TV tuner to a rear-view camera that works as much as possible with the RNS810. The camera doesn’t necessarily have to switch automatically when inserting the reverse gear. If this is done manually at the push of a button, it’s half as wild. I just don’t really see what exactly I need for my vehicle. I found this set in the net. (http://www.service24shop.de/…/…fahrkamera-VW-Phaeton-3D::3117.html) What is this special for a control unit that is installed there? I’m a little bit afraid of the price and now I’m considering whether I can buy the control unit individually and also the original Volkswagen camera. That would have to work as well, right? Or is there another possibility? For example, about the TV tuner? Is it easier to buy and install it and then the cam to do it? VG Tom