Torque Pressure Indicator US Gauge AW1842 OH-6 Cayuse Loach Helicopter Shackleton this pre-WWII instructional manual is

this pre-WWII instructional manual is for the Aircraft Instruments course of The Department of Mechanics in The Air Corps Technical School

The small protrusion right of the digit display counter was likely used to reset the counter to zero once pressed

made by Bendix and labeled for engines #1 & #2 and 3 & #4

There are clear windows around its perimeter

or Sacramento Air Material Area at McClellan Air Base

Torque Pressure Indicator US Gauge AW1842 OH-6 Cayuse Loach Helicopter Shackleton this pre-WWII instructional manual isHere is an engine Torque Pressure Indicator, 0 112. 5 PSI, as appeared in the Vietnam War era light helicopter Hughes OH 6 Cayuse, aka Loach. (see photo of instrument panel, indicator is at upper center). Measures 2. 5 inches diameter by 2. 5 inches deep. .