It was used in the Me109 and Fw190
ORIGINAL, VERY RARE WWII GERMAN LUFTWFFE 0-2/0-10 kg/cm2 Doppeldruckmesser (Dual Pressure Gauge), Fl.20512-2. Used in the Me109 (all versions) and the Fw190A (early) series aircraft. This instrument measured both the fuel and oil pressure. It was located on the main instrument panel and relayed this information to the pilot.