Here's some pics of my JVC installation and FULL TIME backup camera - I ran the input to an extra AV IN input on Head Unit.
The instructions call for backup camera to be connected to the reverse signal wire. I chose to have it on full time….then, that way you can see pickups try to pile drive into turns to follow you! Good times! Wait I OWN a pickup (however, I DO KNOW the difference in handling between a Box and a truck - some people apparently don't). I have almost witnessed 2 accidents - from IN FRONT!
Here is a shot through the rear window after console was painted and rear deck speakers were installed:
Here is a shot inside from the backup camera:
he wiring is not so easy but do-able.
Just take your time and do it right!