Ok problem solved for the moment. Managed to unscrew the pressure gauge and used some PTFE thread seal on it before tightening it back real tight. Still a very faint hissing sound when I switch on my system, but when I test it with soapy water, negative. Then no more hissing sound at all also.
Hope the problem is solved once and for all but could it be the wet thread seal doing the work? Read that thread seal works only for liquid, so could be that the thread seal is wet now, thus no leak, but it does not work when it dries up again? Guess I can only test it again tonight or tomorrow, while hoping for the best in the mean time.
And comments, advice or experience to share?
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