0-80 PSI gauge
1/4 NPT thread (to suit most regulators)
If you are looking here you have probably just damaged or busted your regulator gauge. Luckily they are easy to replace. Just un-screw the gauge and then screw in the new one.
These regulator gauges can also be used on many other devices as the 1/4 NPT thread is fairly standard and it will suit most standard regulators.
NOTE: Micromatic use an left hand thread so this gauge will not fit Micromatic regulators but almost all other regulators will be compatible.