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stock tach wrong? why?

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Old 07-06-16, 10:08 AM
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stock tach wrong? why?
So my tach is off from my safc by about 800 rpm (lower than safc). I am pretty sure the safc is the correct one of the two judging by engine sound.
Any ideas why this would happen? A fix?
Thanks in advance for any input
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Old 07-10-16, 11:33 AM
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Mine too, gets worse higher the rpm

I use a shift light
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