Fuel Quantity Transfer Indicator Avien 252-010-9A F-8U P-2 Neptune part of the TACAN system

part of the TACAN system used by numerous aircraft of the US Air Force and US Navy from the 1950's thru 1980's

The tag also reads J

The Wing De-icing System worked by channeling (or bleeding) heated air from the engines thru ducts to the wings

and P2V-7 Neptune

Fuel Quantity Transfer Indicator Avien 252-010-9A F-8U P-2 Neptune part of the TACAN systemHere is an instrument that you've probably not seen before. This instrument shows the amount of fuel in pounds transferred via pump from one tank to another, probably for a weight balancing system prior to this being an automatic process. It is part of a 4 unit system which were to be calibrated together (but not in AeroAntique inventory). The label stating TURN PUMP OFF AT 2000, is place on the glass, but over the same text appearing on the dial face