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 6130-00-643-1488
NSN 6320-01-390-5385
NSN 5935-01-064-4867
NSN 5895-01-658-4193
NSN 5965-00-318-6479
NSN 6105-00-158-6853
NSN 7035-01-361-8821
NSN 5855-01-010-4921
NSN 5920-01-281-6466
NSN 5975-01-288-6678
NSN 5935-01-359-8216
NSN 5990-01-633-9503