A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-00-764-1426
NSN 5915-00-150-4694
NSN 6240-01-327-1839
NSN 6240-01-354-1692
NSN 5990-00-594-7291
NSN 5930-00-920-9588
NSN 5975-01-308-8752
NSN 6130-01-025-6770
NSN 5855-00-327-2112
NSN 6685-01-411-9188
NSN 5930-01-516-0909
NSN 5905-01-461-6708