A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-330-7588
NSN 5960-01-486-1996
NSN 6645-01-556-5263
NSN 6610-01-426-5090
NSN 5965-01-633-8849
NSN 6150-00-285-6083
NSN 6110-00-473-5111
NSN 6650-01-174-0928
NSN 5975-01-471-6715
NSN 5975-00-063-3736
NSN 5999-00-306-0990
NSN 5950-01-265-9359