I'm very interested to replicate phillyfan1138's setup:
Metra dash kit for 2012 focus
Keeping the original radio and using Bluetooth Audio for sound. Apparently, Sync is capable of supporting one device for phone audio gateway and another device for A2DP. This works out perfectly because you can still receive phone calls while using the tablet for media.
So now the only problem I have is power. I need a power source which provides enough current to charge the tablet so the battery doesn't just deplete slowly. I think the Nexus 7 charger is rated at 2A.
Does anyone have any idea how I can do this? I've read that some folks wire directly from the the car battery with an inline fuse and 12V-5V USB adapter. I wouldn't mind doing that as it doesn't involve cutting up any factory wiring. But how can I connect a wire from inside the dash to the battery???
If anyone else have a different idea on how to get power to the tablet (keeping stock radio, so no special harness), please let me know. Thanks.