VACUUM GAUGE 3-310-55PRESSURE AND VACUUM GAUGES- MECHANICAL 1 1/4" SUCTION 3-7 IN. HG. B & W (MOONEY) 3-310-551 1/4" SUCTIONDial Range:3-7 IN. HG.Dial Markings and Colors:B & W (MOONEY)Gyro Suction Gauge | 1-1/4 in, 3–7 IN Hg, Black & White MarkingsUMA Gyro Suction gauges are designed to save spac..