jebt2921

This thread is very helpful but I have one additional question and I've looked everywhere to get a clear answer. I have an 08 Tahoe with factory nav and referse camera. How do I give the oem camera power to turn on while I am driving? Since I have factory nav now it isn't displayed in the rear view mirror so I'm not sure if I can tap into the wire mentioned above. I'm trying to avoid having to run a new wire all the way from the oem camera up to the dash to give it constant power. Any help is greatly appreciated!