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factory tach

  1. Greg72

    HEI & Factory Tachs....A new "discovery"...!

    HEI & Factory Tachs....A new \"discovery\"...! For those of you who have been on this list for a while, you already know we've discussed how the GM HEI wreaks havoc with the factory tach and makes it indicate an RPM that is too high..... I have always suspected this was the cause of my high...
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