ScanGuage II
Here's my (fairly) new ScanGuage II...
In the photo below, I'm monitoring 1) Miles remaining on current tank, 2) Instantaneous miles-per-gallon (0.0 since I'm not moving), 3) Instantaneous horsepower, and 4) Water/coolant temperature. Any four of at least 12 gauges can be displayed, plus it reads error codes from your engine, and can be easily moved from car to car.
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