No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 6620-01-085-8688
NSN 5975-01-250-2940
NSN 5935-01-521-4288
NSN 6220-01-660-4029
NSN 5920-01-446-1123
NSN 5855-00-610-4052
NSN 6685-00-232-1274
NSN 6650-01-160-9160
NSN 5920-00-930-1212
NSN 5920-01-354-1598
NSN 5920-01-176-5426
NSN 5835-01-209-6410