No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 6610-01-041-1880
NSN 6650-01-209-6318
NSN 6130-00-897-4240
NSN 5930-00-035-9117
NSN 5985-00-727-5293
NSN 5920-00-283-7178
NSN 4140-01-237-3390
NSN 5895-01-461-4505
NSN 5920-01-613-0712
NSN 5920-00-925-2639
NSN 5975-00-356-4946
NSN 6320-01-592-6248