Cage calls this: infrared phototack (1-20, 000rpm) with (2120) pigtail cable, standard magnet mount; recommended for outdoor use
No other part numbers with same form, fit, and function found.
A tachometer using the stroboscopic, synchronizing principle of operation.
NSN 5998-01-447-2876
NSN 5965-01-268-4460
NSN 6150-01-648-5198
NSN 5920-00-679-7852
NSN 6110-00-813-2328
NSN 5990-01-395-4194
NSN 6685-00-836-4056
NSN 6150-01-246-2112
NSN 5925-01-447-7220
NSN 6110-01-596-1501
NSN 6220-01-560-8821
NSN 6650-00-144-4555