Take it to the welding supply shop, or to a repair shop. You are talking
about something that can really hurt you or burn down your building. Good
ain't cheap and cheap ain't good. Check the local pawn shops and Quarter a
Word ad papers in your area. Try to get a Victor, or common brand name
because you can get them serviced, and they are more reliable. If only the
high side gauge is broken, perhaps you can find a gauge that is broken in
some other way and just take off that one gauge. The threads on those
gauges are standard, and should be interchangeable. Match the threads to be
sure. Just be sure if you change the gauge, or you have it fixed that it is
one hundred percent okay. Use soapy water to check your connections.
Oxygen gauges can be very dangerous if contaminated with dirty oil. When
subjected to high pressure oxygen they can explode. We used to perform
these tests at Dresser (Ashcroft gauges). The results would make you
think twice about buying a cheap replacement that has not been properly
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