A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-00-244-7530
NSN 6145-01-524-0192
NSN 6110-00-814-9234
NSN 5835-00-419-6576
NSN 5930-00-060-5132
NSN 5985-01-164-7405
NSN 6130-00-583-9925
NSN 5999-01-530-1796
NSN 5985-01-227-5520
NSN 6650-01-452-1167
NSN 6620-01-085-2915
NSN 6240-01-160-8499