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For power either...
1) Just buy a ciggarette to mains plug adaptor. Then plug your DC in normally.
2) Replace the PSU with a circuit that takes the 12V and seperates it into the 12,5,3.3V needed, it would be pretty easy. Just use some resistors as potential dividers and that's it.
Then plug the AV into a small LCD screen where ever in the car.
It depends how much you want to integrate it. You could redesign the case and fit it somewhere, or just sit it on the back seat.
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