Aftermarket Headrest w/upgraded Factory Navi

[EMizzle]

Has anyone been able to get aftermarket monitors to work with a Factory navigation HU that was upgraded from base mp3 HU? I have access to a Tech2 but I don't want to go the programming route if I don't have to.

 

[EMizzle]

Sooo....After THOROUGHLY reading the other treads on audio equipment and upgrading, I've come to the conclusion that I threw a bunch of money away. The money I can get back easy, its the time that I lost in doing all this. So that being said, does anyone know of a video switcher/device that will support 5 cameras? I'm thinking of getting an aftermarket radio and would still like to retain the ability to see the cameras.