Airspeed Instrument, Soviet/Russian, Unknown function, Cold War-era F-94 The BC-765 Switch Box was

The BC-765 Switch Box was installed in the cockpit of many bomber or transport aircraft of WW2 as part of the SCR-595 or -695 Identification Friend or Foe (IFF) radio systems

since it has Russian Cyrillic lettering on its face

Bearing Distance Heading

Here is a dual Tachometer for use in military helicopters

such as medium bombers B-25 Mitchell

Airspeed Instrument, Soviet/Russian, Unknown function, Cold War-era F-94 The BC-765 Switch Box wasThis Soviet Russian aircraft instrument appears to be for setting an airspeed between 70 220 kilometers per hour. The center knob turns and rotates the only pointer around the dial. The seemingly pitotstatic pneumatic connections in the back are protected by a beige tube for storage (I'm assuming), and an electrical connector exits the back case. It may be some sort of a stall warning instrument, whereby the pilot could set an airspeed below which a