I've given this a bit more thought and come up with a more elegant way to make the unit turn on and off I think. I've bought an adjustable 12v timer switch/relay ($23+p) that will close the 'power button' circuit for 3 seconds when I turn the igntion to 'acc' or start - this should make it turn on. I'll leave the dash mounted switch however as it's still going to be useful for turning the screen to sleep/wake mode.
Power off will still require user intervention as android doesn't appear to support turning itself off when not on charge etc. So there's a few free apps in the android market that let the unit turn off with a single click - as apposed to the power button being held, confirming that you really want to shut down, then an ok screen to be really really sure. All the shutdown apps require 'root' (master/administrator) access to the device which requires a few small steps to achieve on most devices.



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