Gauge, Vacuum

Circular metal gauge missing glass cover. The face of the gauge has numbers 0-30 around the edge in increments of three. The manufacturers information is on the face, "OSBORNE KILLEY MFG.CO. HAMILTON ONT. VACUUM J.MORRISON MAKER TORONTO 22616". There is a movable arrow in the dented, which ends in a crescent shape. There are three small holes on the bottom edge of the metal body. There is a small threaded pipe coming out the bottom of the gauge.