Been also thinking about this.

Aside from rear camera input, my stone-age XAV-63 has an extra video input, I suppose that can accept feed from a front camera? How can you tell the IR works? My rear camera is *apparently* CCD as I've seen in its label but since it's chinese I'm not sure. It has always been reliable but since I have reverse lights (stock, filament ones), I never wanted any more clarity from the video feed.

Also, aren't the guide lines integrated to the stereo and not the camera? coz I can adjust my lines within the AV setup.