Luftwaffe on-board instruments. Including a temperature indicator, Dampfdruckthermometer, used in most German aircraft. The dial is complete, the numerals are partially faded. Manufacturer's plate JC Eckardt 458636, code FL 20331-2. This device consists essentially of a heat sensor and a display. The two parts are connected to each other by a flexible measuring line. The immersion sleeve, which must be completely immersed in the coolant or lubricant to be measured. A temperature indicator instrument. Complete bakelite case, glass in perfect condition. The needle is phosphorescent. Made by Siemens, code FL 20342. The instrument was used to monitor the temperature of the lubricant and/or coolant. The temperature gauge was installed in many variants of the Messerschmitt Bf 109 and the Focke-Wulf FW 190. Some wear and patina to be noted. Condition II+. Luftwaffe aircraft instruments. Including a Dampfdruckthermometer (temperature/pressure gauge) used in most German aircraft. Complete dial with partially faded numerals. Manufacturer plate JC Eckardt 458636, FL 20331-2. Device composed of a heat sensor and a display unit, both connected by a flexible measuring line. The immersion probe was placed in the coolant or lubricant. Complete Bakelite housing with intact glass. Luminous needle. Manufacturer Siemens, code FL 20342. Used to monitor oil and/or coolant temperature. This type of gauge was installed in many variants of the Messerschmitt Bf 109 and Focke-Wulf Fw 190. Shows wear and patina. Condition II+.