A tachometer using solid state and/or vacuum tube circuitry.
NSN 4140-01-478-2409
NSN 6110-00-429-4777
NSN 5910-01-562-1891
NSN 5975-00-719-9793
NSN 5950-01-629-7170
NSN 5965-01-258-5662
NSN 6610-01-415-5877
NSN 5960-00-279-3536
NSN 5855-01-306-3809
NSN 5910-01-040-2681
NSN 5945-00-248-9419
NSN 4140-01-190-8709