I love the idea of gauges. A gauge is a simple elegant analogue description of a parameter: The speed of your car; The temperature outside, the airspeed velocity of an unladen swallow. It would be pretty cool to have a gauge that can show whatever value you feel like pushing out to it via wifi.
The project will use an esp8266 and arduino promini to drive a stepper and some LED segment displays (because I have all of those parts laying about!) to create a physical gauge that can be configured remotely to display...well, anything you want it to.
I have finally started doing something with this. I have hooked up the servo to the mini, and right now, I am interfacing directly via serial. It is probably the worlds simplest demo at this point. Take a number in via serial and map it to the servo range.
To keep things interesting I printed of a gauge face and mounted it in the face of an old cd case.