Nice additions to the "instrument panel". Also having a 12, I can understand the desire for a rear camera. I've been considering the AnT-Racing one, but maybe this guy has a better, less expensive idea.
goto your local "superstore" (i.e. walmart or sams club) and goto the electronics or auto section. you should be able to find one of these camera's for a car, which you can easily adapt to your bike also. at the local store here i can find them in the car section next to the car sound system stuff. $80 for one there.