6.5 L Diesel Tachometer Reads Higher Than It Should

I think I have a problem with my 6.5 L diesel tachometer. I think it reads higher than it should. It seems to have changed since the alternator was replaced, but I cannot understand how this could have caused any change. Can you help me understand?


The tachometer in your truck is driven off of the alternator. Remanufactured alternators are often equipped with a

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Bill Heath owns Heath Diesel Power in Ellensburg, Washington. He races at Bonneville in his 6.5L Land Speed Racer whenever he gets the chance.


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