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Generator pulley diameter

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Rhodyspit75

Rhodyspit75

Jedi Knight
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I need to know the pulley diameter for a tach drive generator. I received one for my generator/alternator and I am concerned because it looks smaller than the ones I have seen in pictures. If it’s not the right size my tach won’t be correct.
 
Mine measures 3 9/16" across. I suspect it's the correct one, but couldn't say for sure. It will be interesting to see what others come up with.
Gary
 
These are the reasons why I went with Speedhut GPS Speedo and Matching Tach. None of these headaches to worry about,
 
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