the harness that came with it had the wrong pins on it for the video/shield that plugs into the radio. had to use some VW terminal repair wire sets. the harness pictured in the ebay auction has the right terminals tho.
harness runs from the rear emblem, around the right side of the hatch, through the right side rubber wire harness boot into the rear of the roof, then down the right c-pillar, down the right rear wheel housing (trim next to right rear seat back), along the right sill to the right lower a-pillar trim (kick panel) and up into the glove box. 2 terminals go into the radio.
then the harness continues behind the dash to the left side of the car, 1 pin goes to the vacant SC18 (need a 7.5a fuse) and the other pin goes to plug "a" of the j519 for the reversing signal.
to do it properly, the complete center console, left knee trims, fuse box, right sill panels, left and right kick panels (and hood release lever), rear seat bench, right rear seat back side trim, right c-pillar, and all of the hatch trim have to come off.
the PDF the seller sent me says "fitting time of approximately 60 minutes" is complete BS. i could probably do another one i about 4-5 hours
on the plus side, everything worked and all i needed to do was change one bit for the video feed to show up.