just a thought, i never knew when cookbot was doing his tablet which one he went for. ive dont a bit of searching and found this, it runs android 4.1 so there would only be one external button to hard wire in for the power, as the control buttons are 'soft buttons' on the screen.
it has bluetooth so can be paired up with an OBDII unit to install the Torque app and get all the gauges.
http://www.ebuyer.co...let-pc-so-55662