Hydraulic Pressure Gauge, 20 PSI P-51 Many of these instruments were

Many of these instruments were common in the US Army helicopters used during the Viet Nam War

While "Elgin" cannot be found on the watch or the packaging

It was his responsibility to ensure that the dials on the handset for altitude

The co-pilot would select the tank to view by rotating the knob

This manual covered versions B-36D and reconnaissance versions RB-36D and RB-36E

Hydraulic Pressure Gauge, 20 PSI P-51 Many of these instruments wereHere is a aircraft Hydraulic Pressure Gauge, 0 20 PSI, made by Manning, Maxwell, and Moore, part number 6730 03. It is in fair condition. The glass and case are intact. Measures 2. 25 inches diameter and ~2 inches deep.