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  #1 (permalink)  
Old 07-08-2005, 08:47 PM
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Join Date: Apr 2005
Location: Near Chattanooga, TN
Cobra Make, Engine: SPF, 418 Stroker
Posts: 220
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Unhappy Tachometer Reading Low
My Smith's tach is consistently about 25% low. For example, the MSD 6000 rpm rev limit chip shuts the engine off when the tach is at about 4500, and the 3000 rpm chip shuts it down at about 2400. It's a 6AL MSD with a tach adapter. Comparison of tach readings with calculated rpm/mph data also indicates an error on the low side of about 25%. Anyone have experience with this kind of problem? Or suggestions on how to fix?
Thanks very much.
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