Torque Pressure / BMEP Indicators, Dual Engines 1&2, 3&4, C-121 Lockheed Constellation Air Forces of USA Has a date stamp of

Has a date stamp of either Q1-1957 or 1967

The center knob adjusts the rate of change pointer

The caging knob rotates but is not accurate in its caging of the gyro

The other modules are three servo units (aileron

Torque Pressure / BMEP Indicators, Dual Engines 1&2, 3&4, C-121 Lockheed Constellation Air Forces of USA Has a date stamp ofThis is a matched set of dual engine Torque Pressure BMEP Indicators, one marked for engines 1 & 2, the other marked for engines 3 & 4, as used in the US Air Force C 121 transport version of the Lockheed Constellation. See photo of the location of the instruments on the Flight Engineers lower instrument panel from the C 121 flight manual dated 1958. One has a service date of 1973 stamped on its side. Both are in nice condition. The glass on the