Ok
So you have good outlet pressure
If this is the case and if you don't see any bubbles then no it's not getting air
I believe either the valve to the gage is faulty like you said or possible the gage
To determine which one take the gage off and see if water comes out
If it doesn't then it's the valve
I hope this helps if not let me know.If it did please click the {Green}accept button
A bonus is always nice and don't forget to leave feed back
thanks Glenn