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I need to correct something: It appears that my Tach is off all the way through the RPM band by 250 RPM (it's hard to tell when you're driving and trying to look at the Tach and the Read out). This makes sense since the needle sits at 500RPM (which is really only 250 RPM value off of zero). So the question is this: What do I need to do to reset the needle back to 0 and thereby fix my inaccurate Tach?
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