The Flair 58 gauge isn't registering any pressure.
Unless you are experiencing a clear, water-leak where an o-ring seal is, then a lack of pressure is related to the coffee bed itself. Grind finer until you're on target!
The Flair 58 requires a very fine grind size due to the wide-and-shallow coffee bed a 58mm portafilter creates. If you can't go any finer on your grinder, and have no room to dose a few extra grams, your grinder likely isn't "espresso capable." Check out this article to learn more.
If you are feeling pressure (i.e the lever is difficult to lower) but there is no reading on the gauge, contact us to troubleshoot a potential gauge defect or breakage.