Jim
I assume your coach is similar to mine. If so, then you can possibly take the video feed from the Aladdin box (in the dash) and then use the monitor associated with the Kenwood gps. You'll need a double female rca connector and a piece of video cable (basic rca fittings, usually has yellow ends). There is a video in port on the gps controller box. Once it is set (some playing With assistance from the manual), then you can toggle on the gps monitor between gps and camera. If you have it, I'll try to remember to go look at mine to see the settings.
It works well as I can have the ar camera on while the 707 shows engine functions. Also, I can leave it on and use the 707 to toggle between the different side cameras.
Jeff