Fuel Quantity Indicator, S2E Tracker, Avien
This is a Fuel Quantity Gage/Indicator, capacitor-type, made by Avien, part number 162-043-430, as appeared in aircraft such as the Grumman S2E Tracker Antisubmarine Warfare aircraft (according to their flight manuals, see photos of the gage as it appears on the pilots instrument panel) of the United States Navy during the 1960-70's.
The instrument is in exceptional but experienced condition given its age. The dial markings are clear and the glass and case are intact. Would be a terrific addition to any collection of Vietnam-era aviation memorabilia.