No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 5985-01-442-8742
NSN 5935-01-518-9455
NSN 6620-01-374-2628
NSN 5930-00-153-1400
NSN 6620-00-996-8026
NSN 6145-00-343-5967
NSN 5945-01-482-9282
NSN 6220-01-247-4381
NSN 6145-01-641-1405
NSN 6685-01-540-2517
NSN 5905-01-607-9731
NSN 5935-01-500-1224