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Got a boost gauge? A vacuum gauge measures the vacuum (or pull) in the inlet plenum. If you have a boost gauge you will notice how when you are at idle it will read something similar to -20 in hg or something like that. When the gauge registers boost > 0 psi it means the turbo has supplying more are than what the engine is sucking (becomes forced aspiration).

Vacuum gauges are handy if you are driving for maximum economy : more vacuum = less fuel used. They can also be used to diagnose mechanical problems in the valve train.

Cheers,

G

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