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Bench testing a tach
The tach on my Grady wasn't working. I'm in the middle of doing some repairs so I can't check the signal from the engine. I tried to put voltage from a jumper pack to it but it didn't do anything. I tried the same thing with a known good tach that had a broken face and had the same result. Anyone know the proper way to bench test a tach?
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1999 Wellcraft 22WA-200 Ocean Runner 1982 Grady White Tarpon 190-110 Evinrude-Sold 1996 Striper 2100WA-RIP Sandy 1989 Wellcraft 18-Sport-125 Force-sold 
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Threaded Mode