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I have a Smith regulator that came with my Miller 252. When the gas is turned on the tank the low pressure gauge slowly keeps rising. If the mig gun is triggered the pressure falls and I hear gas coming out of the gun. When the trigger is let off the low pressure gage continues to rise irrespective to the adjustment on the screw. When the gas is fully bled off the gage stays at 10 and will not return to zero. what is wrong with the gage?
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As MMw says, it could certainly be a bad diaphragm.
If you decide to replace the regulator, I suggest a flow meter such as a Smith or a Victor. I like the visual aspect of the floating ball. The regulator types are more difficult to read, at least in my opinion.
I have a Victor flow meter on my Millermatic 252 and a Smith on the Syncrowave 200. Both of them were bought about 20 years ago and are still going strong.