I have the Nexus 7, and there's a kernel (Timur's Kernel if you want to search/read more) you can put on it that will have it turn on automatically when it receives power (Car turns on) and then when power goes away (Car turns off) it will shut down and go into a deep sleep mode and can last for a pretty long time. Unless it bricks, you'll never have to use any of the buttons and it can be a fixed installation.
I have the tablet all set up for installation into my car, I just have been trying to find the best way to mount it and also wire it as well. I would certainly try this out if you were to sell it.
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2015 Nissan 370z Sports Coupe 6MT Magnetic Black
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