A tachometer using solid state and/or vacuum tube circuitry.
NSN 4140-01-580-3291
NSN 5855-00-906-5386
NSN 5998-00-466-3142
NSN 6685-01-656-1282
NSN 5996-00-887-6767
NSN 5920-01-291-0906
NSN 6620-01-605-2590
NSN 6320-00-857-4073
NSN 5975-00-172-0568
NSN 6110-01-251-5204
NSN 5996-00-827-2094
NSN 2925-00-149-0760