A tachometer using solid state and/or vacuum tube circuitry.
NSN 5895-01-216-1184
NSN 6610-00-559-9552
NSN 6620-01-343-1625
NSN 6685-00-690-2544
NSN 5945-01-170-2268
NSN 2925-01-230-8057
NSN 6220-00-227-8209
NSN 5996-00-960-7810
NSN 7035-01-506-4367
NSN 6145-01-252-9373
NSN 5965-01-093-0642
NSN 5998-01-122-3609