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Tach Problems

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Aug 18, 2009 | 04:08 PM

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Tach Problems

Hi Guys,
Just had my fuel pressure reg changed at the shop and when I got my car back the tach is reading about 500 to 700 rpms low. I know the engine is running good but I doubt I'm taching 100 at idle.
Any thoughts where I should look, I'm not too familiar with the workings of the tach.
Thanks

87 iroc Z 305 tpi.

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