Horsepower Indicator, -500 to 5000 HP, Allison Engine US Coast Guard and on the B-29 it

and on the B-29 it was installed on the flight engineers instrument panel

and the front page of the Collins sales brochure

with a service stamp of Oct 1968

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

a component of the 1950's-era Smiths Military Flight System

Horsepower Indicator, -500 to 5000 HP, Allison Engine US Coast Guard and on the B-29 itThis 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.