A tachometer using solid state and/or vacuum tube circuitry.
NSN 4140-01-444-7543
NSN 5895-00-688-9075
NSN 5915-00-528-1192
NSN 5915-00-747-9679
NSN 5895-01-429-8003
NSN 5960-01-180-8000
NSN 5996-00-942-2092
NSN 5905-00-481-4142
NSN 6240-01-640-7265
NSN 5998-00-583-6570
NSN 5920-00-467-9274
NSN 4140-00-648-3303