A tachometer using solid state and/or vacuum tube circuitry.
NSN 5855-00-869-3635
NSN 5945-01-291-0853
NSN 6650-01-619-9986
NSN 6645-01-018-7664
NSN 6150-00-914-2870
NSN 5945-01-199-5603
NSN 5905-01-128-3390
NSN 6150-01-433-8350
NSN 6685-00-964-7774
NSN 6130-01-620-7678
NSN 6135-01-533-8196
NSN 5930-00-689-4815