Originally Posted by sonetlumiere85
the high pressure gauge depletes when there's no Co2 coming out of the tank and any "free" pressure in your lines/keg is gone, in my experience.
I have a new 2keg system and I was pressure testing it this week after replacing all the seals and prior to actually using it. I was shutting off the tank valve and ensuring that the regulator pressure didn't change as a test. The post reg pressure is stable at ~11psi after 24 hours; however over the course of ~30 min the hi pressure gauge was at zero. I assume this is due to the extremely low volume of High pressure gas that is trapped between the tank shutoff and the regulator coupled with things as simple as temperature fluctuations as the refrigerator cycles on and off, barometric pressure, and the gremlin that feeds my paranoia as a first time keg owner/user. Does that sound about right.
in essence, don't worry about it, have a beer and relax?