Horsepower Indicator, -500 to 5000 HP, Allison Engine US Coast Guard and the front page of

and the front page of the Collins sales brochure

Mounted within the ball turret at the right foot of the ball turret gunner (see photo)

Aichi E13A Type Zero Reconnaissance Seaplane aka "Jake"

but is frozen in position in this specimen and may be able to be repaired

labeled for engines #1 & #2 and 3 and #4

Horsepower Indicator, -500 to 5000 HP, Allison Engine US Coast Guard and the front page ofThis is a Horsepower Indicator, displaying HP from 500 to 5000 HP at 100% RPM. This was manufactured by Hickock Electrical Instrument Co., part number 560 422, also labeled with an Allison Engine part number 6734355A. Measures 2. 25 inches diameter and ~3 inches deep.