Engine Gauge Unit (Triple), Type B-7 DC-3 This 235-page manual contains information

This 235-page manual contains information on aircraft structure

It appears to be a manual back-up device for use in an emergency

Also included is a spare rubber eyepiece

and many fold-out pages

Engine Gauge Unit (Triple), Type B-7 DC-3 This 235-page manual contains informationThe WWII era Engine Gauge Unit (aka Triple Gauge), B 7, displayed the performance of 3 engine parameters in one instrument: Oil Temperature, Oil Pressure, and Fuel Pressure. The B 7 unit was used in the US Army Air Force fighters P 38E Lightning, P 40 Warhawk, P 47 Thunderbolt, and P 51 Mustang according to their Maintenance Interchangeability Chart dated Feb 1945, as well as having been used in other military aircraft post war. The serial number