Fuel Quantity Indicator, TBM Avenger (early), 4 Tank, Liquidometer EA-101-1 A-29 Hudson The knobs are stiff but

The knobs are stiff but rotate

base plate

made by Bendix to a Douglas spec (see data label)

a component of the US Army Air Force's RC-96-A Contactor System intended to work with the the British RAF "Pipsqueak" system

the rotating display for each wheel shows an extended image of a wheel

Fuel Quantity Indicator, TBM Avenger (early), 4 Tank, Liquidometer EA-101-1 A-29 Hudson The knobs are stiff butHere is another exceptional artifact from the iconic WWII era US Navy Torpedo Bomber, the TBM Avenger: a 4 tank Fuel Quantity Indicator. Made by Liquidometer, part number EA 101 1, the unit indicated fuel quantity in four tanks: left, right, and center wing tanks, and the bomb bay droppable tank, in concentric scales respectively starting from center axis. This indicator appeared in early versions of the TBM and can be seen in this TBM F training