Vacuum Gauge as Boost Gauge?

[Op-Ivy]

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?

[Mathdiesel]

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.

[mpg]

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.

[TDForNow]

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

[Darkness_is_spreading]

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.

[shwartzbewithyou]

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.

[Mark(The Miser)UK]

I use a boost gauge with the ombined vac. This monitors state of air filter when it's not showing boost ie at idle.