A tachometer using solid state and/or vacuum tube circuitry.
NSN 7035-01-633-9537
NSN 5998-00-312-3060
NSN 6650-01-594-9915
NSN 5975-01-198-0651
NSN 6130-01-406-5158
NSN 6105-01-247-7352
NSN 6110-01-301-2255
NSN 6620-00-492-4936
NSN 5915-00-858-8244
NSN 6320-00-456-2092
NSN 6645-00-998-7820
NSN 5999-00-268-3022