What I'm trying to do is add a camera to our RV. I'll have a RCA cable coming from the back to the D2. I want the camera on all the time, not just when it's in reverse. The camera is one I got off of Ebay. It has a vedio out rca and power cable. I think I only need to connect this to the yellow video input, or does it go into the rear view camera input? I want to see traffic behind me whild driving.