[QUOTE=Scriptorum;3828485]I just found this video where some guy with a dirty finger shows a third-party backup camera on a 2012 Focus SE SFE and talks a little about the wiring. However he does not actually show its operation, so I don't know if he's hooked it into the center display (doesn't look like an MFT). There appears to be something on the left dash that could be the rear camera display.
He did use a separate small display and mount it on the dash. Not something I would want to do. If I can get it in the MFT screen that is absolute best.
Bump on someone figuring this out!