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No but but it would be super simple and cost less than $100. Or you could buy the one they have at Costco for $75
sorry, didnt see the "how could you" part.
1) Get a backup camera. Range from $20 to $?? (depends on how good you want it, b/w, color, IR for night vision). Just make sure it puts out nstc pal (rca jacks as output).
2) Get a screen for display. There are a bunch of small composit screens, look on ebay. If you look at "computer monitor type vga screens" the smallest you will probably find is around six inches (might be a little large for just a backup camera).
3) Install the camera, ground it and get the power by splicing into the reverse light circut. Install the screen and use the adapter it comes with for power.
just get a small LCD screen and a cheapo camera and wire em together. should be no need for logic board at all. make sure the screen excepts a standard ntsc video input (the yellow plugs) and that the camera outputs the same which most should.