i finally decided to add an aftermarket backup camera to my 2013 vw passat s. the radio is just that, a radio, no screen at all. i can’t do it myself, just not going there. so, i will look for a decent local car electronics shop. what do i need to know so i don’t sound like a complete schmuck when i make the order? hopefully one of you kind fellows has already plowed this field, with a vw no less...