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A trigger from the reverse light wire to a relay to provide power to the camera is quite easy. Xenarc screens have the ability to auto switch to AV when a signal is detected.
Not sure if Lilliput screens have the same or not.
When I get around to it I will be using a video capture card to the PC, so software will drive the display - with record abilities too. I think I'll use something like fusion brain to send a hot key to switch the display when reverse is selected.
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