Barometer on dive station. Properly called a manometer, some made by Taylor, and labelled "TYCOS", others by Bendix Friez Instrument. Always labelled "US NAVY". The photo above is from Pampanito in 1945. Early boats had a silver dial as above, later boats had a black dial with white lettering that glowed in the dark. Dial goes up to 36" or 38" of mercury whereas normal Navy barometers go to 31" or 33".
We need two of these, one for the dive station in control room, and one for the conning tower. We also need another of the mounting brackets. See also barometer/mystery in conning tower.