Replacing a broken gauge on your pressure regulator is a snap with this Replacement Low Pressure Gauge for CO2 or Nitrogen regulator. Installation is simple, and it prevents you from needing to buy a whole new regulator.
Wish I could submit pictures. Purchased two gauges. One gauge read One PSI when received, with no input. Second one, the needle was hard against the zero-stop pin. Flipping the needle over the pin, it went to about MINUS Five or Six PSI. And this one has an abrasion in the center of the lens - cosmetic.
Easily fixed, pry the needles carefully off the little pin, and press them back on reading Zero.
So, cheap Chinese product, with poor Quality Control. Surprised? Not really. Should work OK after the fix above.