Wiring up the reverse lights in the mirrors, as well as the defrost function. The reverse light wiring is a pain to get to under the dash (I spent hours trying to find the light green wire I needed). So, thanks to the Diesel Place forum, I found there's a reverse light in the A-pillar. Simply tapped into that .... man is that easier to get to.
The 3rd picture is the existing wire for the rear defrost function out of the convenience center under the driver's side dash.