Temperature Indicator, Electrical, 160deg C, Luftwaffe Fl.20358 FW190 Curtiss It appears to be either

It appears to be either a Type 98 or 100

and then the opened window would be affixed to the internal cockpit ceiling with the snap-fit strap

It measures 2

These were also used in twin engine aircraft of the US Army Air Force such as B-25

or Gyro Horizon

Temperature Indicator, Electrical, 160deg C, Luftwaffe Fl.20358 FW190 Curtiss It appears to be eitherHere is a WWII era electrical Temperature Indicator used in aircraft of the German Luftwaffe, measuring temperature from 10 deg C to 160 deg C. Likely used to measure cylinder head or oil temperature, the flexibility facilitated by the adjustable limit pointers. It is labeled Fl. 20358, and was made by Hartmann & Braun. According to references on the internet, this instrument appeared in Luftwaffe aircraft Focke Wulf 190 D 9, FW Ta 152, Dornier Do