Fuel Quantity Indicator, C-54 Douglas Skymaster, Liquidometer EA101-19, DC-4
Here is a Fuel Quantity Indicator, Liquidometer part number EA101-19 as illustrated on in the US Army Air Force's Flight Manual, dated January 1945, for the Douglas C-54 Skymaster Transport (see photo). Appearing on the co-pilots panel, it is marked for the Inboard fuel tank. Measures 3.25in diameter and ~3in deep.
It is in nice condition given its age. The dial markings are clear and the glass and case are intact. See photos.