So the radio in my car was slowly morphing into a paperweight as if it was some sort of electronic Pokemon. It rarely worked properly and when it did it wasn't for long. I decided on removing the thing and replacing it with the Nexus 7. I mostly did this just to see if I could as well as to see how useful it was. Now, people have done this in the past many so this wasn't a road untraveled. After much reading and planning I came up with this diagram:

Mind you I have no electronics background (or blog composing background so excuse the terrible writing). The plan looked good, so the parts were ordered and surprisingly everything worked very well.

The Nexus 7 runs a version of CM11 with a custom kernel to allow the thing to both charge AND act as a USB host. It also allows the use of a USB DAC (fancy term for an external sound card). I tried plugging the 3.5mm audio cable directly from the Nexus to the amp but it sounded like garbage so went with the DAC. The equalizer isn't really needed but I went with it anyways.

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On the diagram you may have noticed "Backup camera". YES! It has a backup camera, the only caveat is you have the press the little camera button on the screen for it to open. I'm trying to figure out a way to trigger the camera with the reverse lights but that's for another time. So for now I have a small webcam by the license plate (forgot to take pics but just use your imagination).

The External storage is just a thumb drive for now but I'm going to experiment with a portable 2.5in 1TD hard drive I have once I get a chance however it might be too much a drain powerwise.

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A huge part of the operation is a program called Tasker. It's an insanely powerful tasking program for Android. Basically once it notices a power/charge (by turning the key) it turns on the following: Wi-Fi, Screen to 'Always on', Volume to max, GPS, and turns off Airplane mode. When I turn the key to the off and the charge stops, all of those things turn off to conserve battery and it goes into a sort of deep sleep mode. Very neat program.

Also, there are two cigarette lighters; one that I wired in with the stock lighter that sits behind the nexus and the other is the main one on the dash that charges my phone

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I'm currently stationed in Japan (USAF) and the radio here is horrendous so I mostly just stream via Google Music, Tunein, ect...

The only real 'issue' is the Nexus 7's screen is polarized so when I wear my polarized sunglasses it sorta is impossible to see but beyond that it's the cat's pajamas. I'm sure I glazed over a lot of the details but that's the jist if it.