I know this is a really old thread but I thought I would mention what I'm going to experiment with. Using the information from this thread I am going to use the drz video mirror and the rearview camera. I also found a FAKRA video switcher that I plan to use in conjunction with a backup camera and the rearview camera. I will connect the power for the video switch to the reverse trigger and display the backup cam on the mirror when in reverse and the rearview when not in reverse. All the parts have been ordered and are in transit. I will keep you posted.