I have wanted a Nexus tablet in my car since I bought it almost 2 years ago and have posted many comments in other threads, so I'm going to keep it relatively short.
Equipment:
2nd Gen (2013) Asus Nexus 7 wifi tablet - $270
Timur's 2013 kernal - $30
12v --> 5v USB dual charger - $5
USB y-cable - $5
Behringer UCA202 DAC (digital USB soundcard) - $40
[04+ Legacy] Double DIN console Panel (~AU$250 delivered)- http://www.avojdm.com/product_info.php?products_id=108
Software:
Car Dashdroid (launder, GPS speed, etc) - https://play.google.com/store/apps/deta ... roid&hl=en
Rocketplayer (music) - https://play.google.com/store/apps/deta ... ayer&hl=en
TabletTalk (phone to tablet calls, $3.43) - https://play.google.com/store/apps/deta ... talk&hl=en
Wifi Transfer Pro (for getting music onto your tablet, $1.33) - https://play.google.com/store/apps/deta ... rpro&hl=en
Tethering widget (for quick access to activate 3g hotspot) - https://play.google.com/store/apps/deta ... royo&hl=en
TuneIn (for music) - https://play.google.com/store/apps/deta ... ayer&hl=en
Torque Pro (car temps, speed, boost and all other data, $4.95) - https://play.google.com/store/apps/deta ... rque&hl=en
After trying many power combinations, including a US-sourced Scosche Revolt 12w + 12v USB charger, I found that what worked best for me was a $5 Ebay 2.1A + 1A charger. For some reason the Revolt, which has dual 2.4A USB outputs, actually prevented proper shutdown
Apparently the 2013 Nexus has a much more efficient charging process than the 2012 version, so it doesn't require a fancy power source. I've been running mine off the abovementioned charger for about 6 weeks with no issues. It usually sits at 100% charge, the only exception to that being when I forget to shut down Torque or Car Dashdroid which prevents proper hibernation.
OUTSTANDING ISSUES:
If you decide to open up the 2013 version to relocate the charging and 3.5mm stereo jacks, it does not contain ribbon cables, so you can't glue to the back of the tablet case as others have done. The result is that I have a micro USB plug in the side which is preventing proper operation of the centre air vents.
Overall, I would definitely recommend this - you maintain a relatively stock look, have significantly enhanced sound over radio or CD; as well as heaps of music at your fingertips, GPS, maps, diagnostics and ECU data, etc
Any questions, please ask!