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tach wire trouble shooting

riverrat1

New member
have a 92 nissan NS 90A 3B7-1 Outboard motor. Original Tack would work intermittent so replaced with New/Used one. Tach still does not work suspect wire issue. I do not know how to go about diagnosing the problem with the wires. Want to test with multimeter but do not know how. I have blue and Black wires, Yellow and white wires and green and red wires. Any help would be appreciated.
 
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