A tachometer using solid state and/or vacuum tube circuitry.
NSN 6685-00-229-7350
NSN 6110-00-236-4161
NSN 5960-00-525-1898
NSN 5965-01-438-0647
NSN 6685-01-439-9039
NSN 6105-00-888-1948
NSN 5920-01-216-1981
NSN 6135-01-247-5660
NSN 5925-00-142-0752
NSN 6610-01-084-8224
NSN 5998-01-565-4835
NSN 5935-01-065-1237