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Hello -
My mechanic used his professional vacuum gauge and it read 17 in. Hg at idle RPM. He tapped into the same connection my vacuum gauge is using.
Verdict: My vacuum gauge is crummy.
The Lesson: Don't buy cheapy Garage-Pro vacuum gauge from JC Whitney or you'll get what you pay for.
I'm working on getting a better V-Gauge.
CarloSW2
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