A tachometer using solid state and/or vacuum tube circuitry.
NSN 6145-01-053-2969
NSN 4140-00-269-5795
NSN 7035-01-211-5636
NSN 6145-01-262-4781
NSN 6240-01-123-9040
NSN 5975-01-333-4108
NSN 5855-01-018-1247
NSN 2925-01-629-9416
NSN 6110-01-273-0223
NSN 5910-00-944-5738
NSN 5996-01-485-0305
NSN 6645-01-076-4655