This happened overnight a week or so ago. The hi pressure read as normal, on a corny; next morning I happened to glance and the hi pressure gauge was at 0, yet the low pressure readout was still reading at setpoint (it is a tripel, cold crashed, at 14 psi). Puzzled, I pulled relief valves on both the corny and the regulator, and plenty of CO2 under pressure. I just weighed the tank and it's at 10# 10 oz. The hi pressure gauge is broken, right?