I have on order a heads up display (Hudway Drive), which can accept a video signal to display when the car is in reverse. My 2019 SL already has a backup camera, so ideally tapping or otherwise accessing the composite video feed to connect to the HUD would be perfect.
I did some searching and I can find a lot of 3rd party wiring harnesses for use when replacing the head unit, but as far as I can tell they won't work in my situation because I would like to maintain the signal into the headunit as well.
Is this possible? Does anyone know what wire I would need to tap, or an existing harness which I could add to duplicate the composite signal?