Tachometer, Helicopter, USSR 0-4000 RPM C-7 The round turret silhouette in

The round turret silhouette in the center of the dial rotated as the turret rotated relative to the forward direction of the aircraft

and lettering are in exceptional condition

The N-1 system was commonly used in early models of the US Air Force bomber B-52 Stratofortress

such as the P-40

The glass is clear and intact

Tachometer, Helicopter, USSR 0-4000 RPM C-7 The round turret silhouette inHere is a Cold War era electronic dual Tachometer, 0 4000 RPM, as used in military helicopters of the USSR and Poland such as the MIL MI 1 (see cockpit photo, the tachometer is in the middle of the second column of instruments from the right) and MIL MI 4 (see cockpit photo, the tach is in the bottom row 3rd instrument from left). The pointer labeled "P" indicates RPMs of the Rotor, while the pointer labeled "M" indicates RPMs of the Engine. It is in