A tachometer using solid state and/or vacuum tube circuitry.
NSN 6650-01-373-5912
NSN 6220-00-167-2154
NSN 5915-01-331-1754
NSN 6105-01-345-1490
NSN 5915-00-442-5168
NSN 6240-00-221-0859
NSN 6240-01-633-9357
NSN 5998-01-189-8263
NSN 5905-01-135-7032
NSN 6650-01-496-8962
NSN 6135-00-613-1068
NSN 5930-01-536-9341