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I installed a vac gauge on my car--had it on the pillar by the drivers door
I held right at 22 inches at roughly 800 feet above sea level--If I drove up
to 3000 feet--it would hold at 18--but haveing the gauge woud let me know
if a leak was starting to appear--if I had a leak it would drop off a couple of digits and I'd start looking to the culprit---what I'm trying to point out though is you would need to find whats right for your altitude and work from that point to what your normal vac would be.
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