I recently bought these two products:
I installed them successfully.
Then, I bought this:
Now, the rear view monitor/dash cam directly above comes with a backup camera, but I would like to avoid installing it and instead simply use the camera I already installed.
The video cable from the existing camera is a yellow RCA, and the input for the new display is 3.5mm jack. So at a minimum, I think I would need an RCA splitter, and a cable that was RCA on one end and 3.5mm on the other end.
The part I'm not sure of is the always-on nature of the rear-view mirror display, vs. the reverse-light-trigger that my existing camera uses.
If I just fed the video signal from my existing camera to the new rear-view display, would it only show when the car was in reverse? Or is the video signal transmitted regardless?