I have a slightly different experience of the gauge. On mine, it will "settle" if you tip the engine about. However, once up to steam the level is likely to show at or very near the top of the gauge and then steadfastly refuse to come down during the run. Only at the end, when the burner is out and you're running the pressure down will it come back to reality.
As a result, I just don't trust it and tend to run on a timed basis. After 20 minutes steaming at low throttle, out goes the burner and that's it, no matter the gauge reading. I use 180ml of cold water to start with and after the run the burner tube is still covered, so I know I'm ok.
A couple of words of caution to the OP: (1) NEVER tip the engine upside down to empty the boiler, water can run into the pressure gauge if you do - syringe it out instead [that tip was given to me, I can't claim the credit] and (2) Throw away the supplied syringe's silicone tube NOW and replace it with something much longer, or else sooner or later it'll drop into the boiler and you will spend an age recovering it. Yes, I did find out the hard way!
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