https://www.lansoinstruments.com/how-accurate-are-air-pressure-gauges.html
As a general rule a common plunge bourdon type gauge you would purchase will be accurate to + or - 3 psi when it is new.
https://www.lansoinstruments.com/how-accurate-are-air-pressure-gauges.html
As a general rule a common plunge bourdon type gauge you would purchase will be accurate to + or - 3 psi when it is new.