new speed sensors not working

turbokid

Member
hi, we have an rds shaft speed indicator set up on our fert spreader just to show disc speed. however i got a new sensor and it wont register on the clock. they are steel sensors and light up when they see the steel but nothing registering on the clock. there are 4 wires, brown, black, blue and white. brown-power, blue-ground, black-signal and white is not used. anyone have any ideas?
 
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