A tachometer using solid state and/or vacuum tube circuitry.
NSN 6645-00-413-0461
NSN 2925-01-164-4197
NSN 5935-01-558-3927
NSN 5935-01-113-2233
NSN 6610-01-559-5073
NSN 6685-01-272-3867
NSN 6105-01-018-3510
NSN 6105-00-263-1261
NSN 5985-01-281-5207
NSN 6620-00-858-7317
NSN 5905-00-584-1302
NSN 6105-00-533-3142