Fuel Pressure Gauge, 30PSI, PN D-115, AN-5771-1

Here is an aircraft Fuel Pressure Gauge, 0-30PSI, made by Northern Engraving. This type appeared in the US Navy/US Marine Corps versions of the Lockheed P-38 F, G, H, J, and L Lightening Fighter and the Douglas A-20 B and C Light Bomber, Measures 2.25in diameter and ~2in deep.