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Old 05-02-2011, 03:32 AM
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simplyconnected simplyconnected is offline
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Default Good question, John

The best answer I can give is, go to this web site where they have an animated display of gauges (and how they should read with different faults):
CLICK HERE

Eighteen inches of mercury is healthy vacuum. Yes, some get over twenty, but power boosters, etc., depend on eighteen as a 'standard'.

I like the idea of watching a vacuum gauge as you drive because you can see what happens at the light, when your trans shifts, when you stop, etc. - Dave
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