Reverse Camera Wire Routing?

I ordered the tailgate cam for my 08 DC. Can you tell me how you routed the wiring from the head unit back to the tailgate? Through the firewall and then back or some other path? Thank you in advance for your help!

 

When I install them I go through one of the grommets. If you look up at the firewall there should be one you can use or you can pull up the carpet in the drivers floor and route through there. Run the wiring in split loom along the frame and strap up. Make sure you don't have anything hanging that can get snagged. Once you get to the tailgate you may want to leave the connections accessible so if you need to remove the tailgate you can. Hopefully that helps you.