Not sure if you guys could read my video...new leakage found and i tried to replace the 0 ring for times but after dozens of shoot...leakage happens again at same place...
Yep, I just fixed this myself! You need to replace both o-rings in the gauge tube.
IF, for whatever reason that doesn't fix it - you might have a rare case of the gauge leaking (doubtful), both Mr. @centercut and myself had this happen (and I believe at least one other here report. I've since switched to a WIKA analog.