A tachometer using solid state and/or vacuum tube circuitry.
NSN 5965-01-218-7795
NSN 5965-01-485-0940
NSN 5910-01-023-8082
NSN 6685-01-356-8044
NSN 7035-00-902-8995
NSN 5945-01-067-7472
NSN 6145-01-366-5902
NSN 5985-00-725-8311
NSN 5996-01-144-9523
NSN 6650-01-075-6642
NSN 5835-01-357-9235
NSN 6110-01-611-9795