Airspeed / Mach Speed Indicator, 80-850 Knots, 0.4-2.5 Mach, F-8 Crusader H-21 The specifics of the modifications

The specifics of the modifications is not known

This is an authentic WW2 vintage Dual Engine Synchroscope Indicator made by Kollsman

This is a Japanese Voltmeter or Ammeter

Being partially a gyro instrument it has

The manual reviews aircraft engine performance and the effects of different fuels and fuel characteristics

Airspeed / Mach Speed Indicator, 80-850 Knots, 0.4-2.5 Mach, F-8 Crusader H-21 The specifics of the modificationsThis is an Air Speed Mach Speed Indicator as used in the Viet Nam War era US Navy Fighter Vought F 8 Crusader. Made by Bendix, part number 1454 62A B62 1. See photo of indicator on the F 8 panel from its flight manual dated Sept 1978. The indicator displayed airspeed from 80 850 knots, and mach speed from 0. 4 to 2. 5 mach. Airspeed is displayed from 80 200 knots on the scale from 1 4 o'clock, and then from 80+ knots on the center inner scale window