Gunsight, Mark 18, Computing Reflector-type, US Navy WWII, Korean War Viscount which would likely be determined

which would likely be determined by the type of aircraft to be refueled on a mission

This is a vintage Cold-War-era Outboard Wing Tank Fuel Quantity Indicator

are hidden beneath the facing until electricity is applied

made by Kollsman

Gunsight, Mark 18, Computing Reflector-type, US Navy WWII, Korean War Viscount which would likely be determinedThe Gun Sight Mark 18 is an electrically operated, computing, reflector type sight designed for use in power turrets and cockpits. The gunner makes the proper settings on the control units, after which it is only necessary for him to "range and track" the enemy plane, for the sight automatically figures the proper point of aim. It makes no difference whether or not the enemy plane is in a pursuit curve, or whether the gunner is strafing a stationary