A tachometer using solid state and/or vacuum tube circuitry.
NSN 6105-01-422-2292
NSN 6620-01-498-4780
NSN 5920-00-081-9156
NSN 5910-00-971-5715
NSN 6150-01-430-2257
NSN 6130-01-413-3922
NSN 5910-01-050-8451
NSN 5990-00-827-0684
NSN 2925-01-077-6867
NSN 6650-00-498-8192
NSN 5950-01-608-1776
NSN 5935-01-020-0328