A tachometer using solid state and/or vacuum tube circuitry.
NSN 6105-01-004-1808
NSN 5930-00-732-8472
NSN 5910-00-633-7743
NSN 6610-01-055-4147
NSN 5855-00-293-4708
NSN 6685-01-270-2303
NSN 5998-00-548-7702
NSN 5930-01-153-1922
NSN 6320-01-291-4870
NSN 6130-01-055-5272
NSN 5985-00-515-2184
NSN 6135-01-268-2152