Free Air Temperature Indicator, Direct Reading, US Navy R-88-T-1560 FW-190 was used in aircraft with

was used in aircraft with a nose wheel (vs tail wheel aircraft)

whereby a red light would illuminate on the panel if this temp was reached

Here is Radar Pressure Indicator use in radar-equipped aircraft during late WWII and post WWII

3in square

It was installed at the navigators station

Free Air Temperature Indicator, Direct Reading, US Navy R-88-T-1560 FW-190 was used in aircraft withThis is an authentic vintage Direct Reading Free Air Temperature Indicator made by the Rochester Manufacturing Co., PN 1592, as used in US Navy aircraft during WWII, such as patrol bombers PBY Catalina, PB4Y Privateer, PB2Y Coronado, and PBM Mariner. The instrument indicated to the pilot the aircraft's external air temperature from 70dC to +50dC, and would have its stem installed from the cockpit thru the skin or the windshield of the aircraft. The