Torque Pressure / BMEP Indicators, Dual Engines 1&2, 3&4, C-121 Lockheed Constellation Air Forces of USA and P-38 Lightning

and P-38 Lightning

Has a date stamp of either Q1-1957 or 1967

The center knob adjusts the rate of change pointer

Once switched On

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 and P-38 LightningThis 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