Gas gauge calibration unit
Actually, someone already produces a similar product. I'll re-rerrrrr reeee find it.........
EDIT
..............Found it!!!!
Someone had posted it on this board, but I don't remember where or who...........
http://www.technoversions.com/MeterMatchHome.html
"Meter Match"
Link to the destruction manual:
[ame]http://www.technoversions.com/MeterMatchVRInstructionManual.pdf[/ame]
Sounds very very similar to what Dave came up with