A tachometer using solid state and/or vacuum tube circuitry.
NSN 6150-01-295-5940
NSN 5999-00-491-5219
NSN 5996-00-892-4190
NSN 5935-00-222-7602
NSN 5835-01-318-5268
NSN 2925-00-196-9003
NSN 5960-01-560-8461
NSN 5895-01-216-8604
NSN 5999-00-288-5954
NSN 6145-00-413-4578
NSN 6150-01-126-2170
NSN 6135-01-324-2505