Wheel Witness HD PRO Mark II, User Manual

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Rear / Backup Camera (optional)
Connect Rear Camera to the front Camera using rear
camera hardwire kit.
If you don't need to automatically switch camera display to rear
when reversing, just then you do not need to connect the red (+) and
black (-) wires.
Backup Camera Function
If you have the optional rear camera you can use it as a back up
camera when reversing. All you need to do is connect it to the
REVERSE lamp in your vehicle.