Temperature Indicator, Dual Engine, Oil or Coolant, -70 to +150d C, AN5795-6 F-14 made for US military aircraft

made for US military aircraft applications by Elgin (MS28020LI)

these are essentially 2-disc

The lid contains a calculator for speed

The small lamps is present but its operability is unknown

Temperature Indicator, Dual Engine, Oil or Coolant, -70 to +150d C, AN5795-6 F-14 made for US military aircraftThe Army Navy Type AN5795 6 Dual Engine Oil or Coolant Temperature Indicator was used across a number of US Army Air Corps, Navy, and Air Force aircraft during WWII, including heavy bombers B 17, B 24, B 29, medium bombers B 25 and B 26, as well as light bomber A 20, according to the Accessories Interchangeability Chart dated Feb 1945. This indicator was made by Edison, part number 33203, and has a serial number prefix of AF43, indicative of a 1943