Manifold Pressure Gauge Set, Dual Engine, for 4 Engine Aircraft, Bendix, Constellation F-86 The second hand has a

The second hand has a small bit of corrosion on its opposing end

The subsequent Kollsman model 716K-02

See the diagram of the system with an explation of its function in the photo gallery

The two 'button's on the face are red lights which would illuminate the horizon when twisted

Manifold Pressure Gauge Set, Dual Engine, for 4 Engine Aircraft, Bendix, Constellation F-86 The second hand has aThis is a pair of 1950's era dual engine Manifold Pressure Indicators, made by Bendix and labeled for engines #1 & #2 and 3 & #4. Used in post WWII 4 engine aircraft such as B 50, C 54, C 121 etc. The 1958 Flight Manual of the Lockheed C 121 Constellation shows these instruments located on the pilots instrument panel as well the flight engineer's panel. The instruments are in very nice condition for their age. The dial markings are clear and the glass