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Old 06-01-2012, 17:14   #1
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Tachometer Help!

I have a 1985 perkins 4.108 it has a new tach. and a rebuilt alt. the tach is reading higher than it should what should I be looking at to fix?
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Old 06-01-2012, 17:38   #2
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Re: tachometer help!

Should be an adjustment knob on the back of the tach that will allow you to set to the correct RPM.
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Old 06-01-2012, 18:07   #3
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Re: tachometer help!

You need to determine the correct RPMs with a photo tach and adjust the tach accordingly. Here us what we did. Chuck
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Old 08-01-2012, 08:56   #4
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Re: tachometer help!

Thanks for the help !!! all fixed up now!
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