Kurt,
My approach was pretty simple. I unscrewed the complete unit from the rear cap. I then pulled out the center led marker light. The marker light has a white and black wire - I used some high quality taps and just tapped each of the center light wires. I then connected the new power cord from the camera box to these blade taps. I did not want to totally disconnect the factory wiring - so I left it intact, just sealed it from weather. I fed the new power lead and the original wire back into the hole cut at the factory - used some silicon and screwed it all back together.
Two things Kurt. I used a meter to test the wiring and found (news to me) that the BLACK was hot and the white was GROUND. Secondly - the instructions say to pair the units before mounting. Not sure it's necessary - in fact, my said FAILED when I tried but the camera seems to get the signal. Just didn't want you to get too far ahead and find you needed to remove it.
Of course, you'll need you marker lights on for the camera to come on but for me, that's no issue. I drive with my lights on all the time. My camera only gets two bars - best of conditions. It is a black screen near half the time. I need to find a solution or I'll end up hard wiring one.
Good luck - safe travels.<object type="cosymantecnisbfw" cotype="cs" id="SILOBFWOBJECTID" style="width: 0px; height: 0px; display: block;"></object>