EGR help.. posted by 2inTurbo on March 30, 2010 at 11:30 AM
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bodies like at the balance tube. A good running engine will record a very steady needle at all rpms especially idle. A good reading is 20.5"Hg at idle and 21.5" Hg at 2000 rpm with a very steady needle.
Here is a link for interperting vacuum gage behavior: