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Old 11-15-2012, 08:17 PM   #2
Scooby Specialist
Member#: 245218
Join Date: Apr 2010
Chapter/Region: South East
Location: FL
2013 STI Limited


The AP reads vacuum in PSI. Most gauges use Hg to measure vacuum. -10-11PSI is about -20 Hg which is what your car should idle at.
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