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As many of you know, I've posted my "issues" this week trying to build my control/gauge manifold and already wrecked a Wika 0-20 oz gauge. Today the new 0-3 psi gauge arrived and I finished the job. I cycled the system (two-pipe vapor/vacuum) for about an hour. Low and behold, it looks like it's operating below 4 oz! I shut it down to see how long/how much vacuum would register on the new gauge (by pulling PAST zero of course). Compare with the compound gauge to the left. Can the gauge handle going this far past zero? Any one had a couple years under their belt exercising these expensive little buggers? Would a snubber eliminate the pull from the vacuum or can I install an inline check valve? I'm tired of scampering into the boiler room wringing my hands.