A tachometer using solid state and/or vacuum tube circuitry.
NSN 6105-00-855-0760
NSN 5985-00-387-0623
NSN 5835-01-608-3319
NSN 5965-01-005-0341
NSN 5999-00-439-6547
NSN 5990-01-268-2236
NSN 6240-00-045-3203
NSN 5975-01-120-0297
NSN 6105-01-431-5681
NSN 4140-01-068-5772
NSN 6105-00-163-4390
NSN 6650-00-698-5869