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The camera doesn't always need to be on. The installer told you that because they didn't want to run a relay from the headunit to turn the camera on when the stock radio tells it to turn on.
The radio sends a 6v signal that will only turn on when the camera needs to be on. If you power the camera from that signal (or use a relay to send 12v when that 6v signal is on) then it will only be on when the car first starts and when you're in reverse.
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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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