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Engine Specific Info and Questions => IDI Engine => Topic started by: Op-Ivy on April 23, 2006, 10:35:41 am

Title: Vacuum Gauge as Boost Gauge?
Post by: Op-Ivy on April 23, 2006, 10:35:41 am: I found a Vacuum Gauge kit that measures the psi of a vacuum line at princess auto yesterday. It goes from 0-30 psi. Would this work as a boost gauge?
Title: Vacuum Gauge as Boost Gauge?
Post by: Mathdiesel on April 23, 2006, 10:47:46 am: It wouldn't work, and also it most likely be in inches of mercury rather then psi, since vacuum is relative to atmospheric pressure and atmospheric pressure is only 14.7 psi.
Title: Vacuum Gauge as Boost Gauge?
Post by: mpg on April 23, 2006, 05:05:46 pm: princess auto has gauges for compressors and such, that go to 30 psi, and some that go higher. the one i got is for a regulator for an acetylene cutting torch or something, goes to 50psi, and cost me $7.
Title: Vacuum Gauge as Boost Gauge?
Post by: TDForNow on April 23, 2006, 05:32:00 pm: At least in std (us) format, if it reads in "PSI" (Pounds per Square Inch) it measures pressure relative to atmospheric, if it reads in "IN-HG" (inches of mercury) it measures vacuum relative to atmospheric
Title: They have vaccum and Boost Gauge combos at princess
Post by: Darkness_is_spreading on April 24, 2006, 04:49:53 am: I picked up one but it only runs to 20 lbs of boost, but mine is running maybe 27 lbs of boost, and I think I damaged the gauge, because at idle It tells me I'm running 2 lbs of boost :shock: .

I'm going to try the reguator gauges, I have a 0 - 30 pressure gauge prob for oxy and celtaline.
Title: Vacuum Gauge as Boost Gauge?
Post by: shwartzbewithyou on April 24, 2006, 06:28:13 am: I think if you look, the princess auto gauge that you are looking at has boost on one side and vacuum on the other. I think it is a boost gauge.

If you want a cheap gauge they have a pressure gauge in the hydraulics section for $4.99 that measures up to 30 PSI. It's for air filters but the only issue is it doesn't have a light in it because it's not an auto gauge.
That doesn't matter to me because my dash lights don't work anyways but it may to you.
Title: Boost/ vac gauge
Post by: Mark(The Miser)UK on April 25, 2006, 04:58:35 pm: I use a boost gauge with the ombined vac. This monitors state of air filter when it's not showing boost ie at idle.