Rearview camera Backup camera for Mercedes Benz GLK NTG 4.5/4.7 (head unit picture in list). This full set camera kit can help you to installation aftermarket camera for OEM screen/monitor. And there is steering wheel guidelines. Anyway, you need some installation skills or go to the professional installation shop with qualify technician. There are some installation notices. 1, connection of the interface. 2, connect LVDS cable as instruction in the picture. 4, Connect Plug and Play cable. 5, setting correct dip switch to fit your car model and screen size. If your car is manual transmission, the blue trigger wire need to connect reversing light signal +(positive), because manual transmision model has no reverse trigger signal from the CAN BUS. If you are not sure of your car headunit system and trunk handle size, please send us some pictures to check. We can reduce camera price. Just sell the interface.