This is a Gyro Suction Gage used in many Cessna Airplanes. Normal Gyro Suction values are 4.1 to 5.4 inches of mercury. gyro suction vacuum system inches of mercury Cessna Type Gyro Suction Gage
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This is a Gyro Suction Gage used in many Piper Airplanes. Normal Gyro Suction values are 4.1 to 5.4 inches of mercury. piper cherokee gyro suction Piper Gyro Suction Gage