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On a vacuum pump my gauge reads lbs. then I read about inches of mercury. What's the difference, and what would be a suitable setting in pounds?
Thanks Rick
 

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Hey Bill!!
Question I've been thinking about:
How does vacuum change as altitude increases? If I run 8 inches at sea level and I take my car to Santa Fe, elevation 7,000 msl, what does my vac gauge read? Is there a formula, does it go down 2%/1000 feet or ???? Lower than 6?
thx!!
 

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I'm not sure. I do know that It's harder to get good vacuum at high altitude

LOL that's because the pressure you are evacuating is less--atmospheric pressure. Previous poster is right. It's about a 50% ratio "roughly" psi to inches Hg. Sea level is just under 15psi in rough figures, and just under 30" Hg. I refuse to think in "bars." And be careful, somethings are inches of WATER. We used to use that all the time in HVAC for gas/ LP pressure, and duct pressure
 
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