Utility pressure gauges are very common and practically a commodity product with most if not all manufacturers having their gauges made in countries in the Pacific Rim region, such as China, Taiwan and India.
These type of gauges are used by OEM's for compressed air and water systems which do not require significant accuracy (3-2-3%) or longevity; the environment in which they are installed tends to be non-corrosive and dry.
The connections are a copper alloy and the cases typically painted steel although we can offer plastic, plated steel or SS cases if desired.
These are not considered to be "industrial grade" pressure gauges, but if this is what you need, we can provide them at a competitive cost and usually ship from stock.
View/Download the Utility Pressure Gauges catalog section.