A tachometer using solid state and/or vacuum tube circuitry.
NSN 5920-01-062-7106
NSN 6620-01-573-5794
NSN 6110-00-901-0861
NSN 5855-00-149-0766
NSN 6145-00-332-4988
NSN 5855-00-631-4565
NSN 6105-01-557-8315
NSN 5996-01-659-5931
NSN 5975-01-112-3115
NSN 6130-00-104-5573
NSN 6150-01-576-9020
NSN 6650-01-425-7362