

The rear view mirror has been used in The past as a mini screen and I liked it. And if you unhook the camera in my Ford it would flash the little screen blue for a moment then realize nothing was hooked up and would turn off. Though you could just unhook the mirror connector and it would be just a mirror as well if you want to disassemble the interior to unplug it.
I know someone suggested defoger repair but here’s another same cost. https://www.digikey.com/en/product-highlight/m/mg-chemicals/carbon-conductive-pen