Manifold Pressure Indicator, Dual Engine, S2E Tracker, P2V-7 Neptune Northrop but requires the correct electrical

but requires the correct electrical input to function properly

likely used by the US military during the 1940-50s: Voltmeter DC 30-0-30 Volts

to indicate Oil Pressure up to 200 PSI

The serial # prefix starts with AF-43

part number JG702OA-42

Manifold Pressure Indicator, Dual Engine, S2E Tracker, P2V-7 Neptune Northrop but requires the correct electricalThis is a Magnesyn type Manifold Pressure Indicator for a dual engine aircraft, made by Bendix, as appeared in aircraft such as the Grumman S2E Tracker and Lockheed P2V 7 Neptune Antisubmarine Warfare aircraft (according to their flight manuals, see photos of the gage as it appears on the S2E pilots instrument panel) of the United States Navy during the 1950 70's. The instrument is in exceptional but experienced condition given its age. The dial