Reddit reviews Ashcroft Duralife Type 1009 Stainless Steel Case Glycerin Filled Pressure Gauge, Stainless Steel Tube and Socket, 3.5" Dial Size, 1/4" NPT Lower Connection, 0/30" Hg Vac/0/60 psi Pressure Range
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Patented PowerFlex movementAll stainless steel welded constructionTrue Zero pointer indicationNEW ventable plugNEW patent pending through-dial calibration
Throw a ss pressure gauge in the one not being used! May need a few fittings or just throw a ball valve with pressure gauge attached to it because you will need a ball valve on it anyway....
http://www.amazon.com/Ashcroft-Duralife-Stainless-Connection-60/dp/B00FJNLRJG/ref=sr_1_16?ie=UTF8&qid=1422045666&sr=8-16&keywords=stainless+vac+gauge
Cheaper ones are out there for just psi...trying to find one for vacuum and psi at a better price...