A measuring instrument for use with a gas compression system includes a housing having a face, a rear panel, and a wall extending between the rear panel and the face to define an instrument space. A curved tube includes a first end connected to a source of pressure. The curved tube is disposed within the instrument space. An indicator needle is coupled to a second end of the curved tube and is movable with respect to the face in response to changes in pressure from the pressure source. The needle and the face cooperate to indicate a measured pressure of the source of pressure. An electronic display is disposed within the instrument space and is visible through an aperture formed in the face. The electronic display is operable to display data unrelated to the pressure of the source of pressure.