Installing a double din in my 1999 Tacoma with backup camera, need help with a couple wire locations

I have a 1999 Tacoma TRD Regular Cab. I am installing a BOSS CP62CP-C double din head unit in it that I bought from Crutchfield. I had Crutchfield set up my wiring harness for me. The unit comes with a backup camera that I'll be installing as well. They provided me two Posi-Tap connectors to help with me connecting the system up to the Parking Brake signal wire and the Reverse Light (+) wire. I'd like to hook up both within the cab itself. Can anyone direct me to which wires I need to tap into in order to hook that up.

A side question I have is if you happen to know what the best route for me to run the camera wire from the cab to the rear license plate would be.

Thanks for your time and I hope someone here has some insight for me.