In the spirit of out of the box thinking, here are some gauges I find very interesting. They may be more suitable to special applications such as engine stands or other projects but I think the idea is very cool:
http://www.4dsystems.com.au/product/uLCD_220RD/
You can create the graphics for any gauge you want to read your own defined parameters.
16 I/O pins including 4 for analog input
Several TTL or Ic2 inputs
PWM in and out
Encoder inputs
Data logging
Not sure what problem it would solve but it is very cool stuff.
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