A tachometer using solid state and/or vacuum tube circuitry.
NSN 6150-00-394-4934
NSN 5975-00-467-1143
NSN 5925-01-483-5199
NSN 5996-01-463-8197
NSN 5855-01-312-5160
NSN 6130-01-641-4655
NSN 4140-00-242-6465
NSN 6130-01-424-5099
NSN 2925-01-415-0264
NSN 6110-01-091-7827
NSN 5925-00-981-9006
NSN 5925-01-163-6491