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Ovel, I don't understand your second question. The top relay in my diagram switches between the reverse signal coming from the reverse lights on the car and a constant +12V signal. This is fed to the headunit to turn on the reverse display if the car is in reverse or if the switch is not in off. You shouldn't need a diode here. This just turns the camera on when the switch is in one of the back or front camera positions.
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Garage:
2013 BRZ Limited 6MT - Galaxy Blue
1994 Ford Probe GT 5MT - Red(some would argue pink)
1969 Mustang Fastback 4MT - Royal Maroon
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