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You will have to tap into 3 wires; all are available in the harness that runs to the Nav connector.
Reverse (back-up lamps)
Accessory
Ground
I don't know how the $40 and $100 cameras compare because I have not experienced the performance of the latter. My $40 camera seems to have diminished night sensitivity of late. When first installed, I could see 10-15 feet to the rear in total darkness (reverse lights on and helping, of course). That no longer seems to be true, though it's OK otherwise.
I have add'l pics that were not included in the PDF file. I also had to enlarge the hole that passes into the trunk and install a larger weather-proofing grommet. The factory hole is used to run wires to the license plate lamps.
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