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cfg83,
If you're getting 10 inches of mercury, either your engine is sick, or it's a bad vacuum source. Should be getting 15-18 at idle.
Is the needle steady? Does it bounce up and down, or slowly fluctuate? This gauge is a great indicator of both engine health and economy. Check a service manual or on-line reference for details about the readings.
The boost side is a waste of money, unless you have a turbocharger. Not a popular ecomod option...
I've run that gauge for 20 years and it's about the best fuel efficiency meter there is (for ICE).
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