Torque Pressure / BMEP Indicators, Dual Engines 1&2, 3&4, C-121 Lockheed Constellation

This 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 instrument for engines 1 & 2 is a little foggy inside, but could be removed and cleaned. Measures 3.25 inches diameter and 6 inches deep.