A tachometer using solid state and/or vacuum tube circuitry.
NSN 6150-00-419-6846
NSN 6105-00-999-0858
NSN 5950-00-367-2705
NSN 6650-01-521-2077
NSN 6105-00-345-4273
NSN 5990-01-272-4091
NSN 6620-00-448-0667
NSN 4140-00-815-7093
NSN 5975-00-899-0463
NSN 6645-00-764-0412
NSN 5935-00-185-5336
NSN 6135-00-756-6149