A tachometer using solid state and/or vacuum tube circuitry.
NSN 5996-00-175-0462
NSN 5990-01-326-2677
NSN 6320-01-311-6576
NSN 6645-00-099-6913
NSN 5925-01-341-6758
NSN 5999-01-502-8775
NSN 6130-01-604-6081
NSN 5998-01-598-9585
NSN 6620-01-277-9325
NSN 5945-00-833-3283
NSN 6320-01-592-6248
NSN 5920-00-105-3713