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fredrx7

07-06-16 10:08 AM

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

Rob XX 7

07-10-16 11:33 AM

Mine too, gets worse higher the rpm

I use a shift light

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