Please keep us up to date on anything you learn, I am waiting for my badge camera to get here, once I do, I think I am going to go the same route with a separate display, just to simplify things a bit. I am posting the little bit of information that I know at this point in this post. The info cam from this link with a few diagrams, but no wiring diagram.
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Item Part Number Description
1 - Video camera screws (2 required)
2 19G490 Video camera
3 - Ford oval emblem and bezel
4 - Ford oval emblem bezel bolts (2 required)
Removal and Installation
NOTE: The Ford oval emblem must be replaced, as the tabs break during removal.
Remove the Ford oval emblem by carefully prying the emblem away from the emblem bezel with a suitable pry tool.
Remove the 2 emblem bezel bolts.
NOTE: The video camera electrical connector is located underneath the vehicle rear bumper and between the spare tire. There is no need to remove the tailgate access panel in the removal of the video camera.
Disconnect the electrical connector.
Remove the video camera and emblem bezel from the tailgate.
Remove the 2 video camera screws.
Remove the video camera.
To install, reverse the removal procedure.