A tachometer using solid state and/or vacuum tube circuitry.
NSN 6135-01-294-2131
NSN 6650-00-977-7533
NSN 5925-01-462-6069
NSN 5996-01-605-0950
NSN 5920-01-506-0650
NSN 5910-01-507-3683
NSN 7035-01-111-7206
NSN 5990-01-414-7618
NSN 6135-00-228-8140
NSN 5960-01-573-6483
NSN 5945-00-259-1958
NSN 6610-01-535-0310