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<p>[QUOTE=&quot;kwcam, post: 11800551, member: 104013&quot;]Try cleaning the cab ground wire connection at the left front bottom corner, we have had strange gauge issues and when the ground was cleaned at both ends all went back to normal. </p><p>Also an 06 does it have a Cat engine?, then there could be a break in the j1939 wiring that supplies eng data to the dash, check the yellow and green twisted pair where it comes out of the ecm plug, have seen a zip tie there rub the wires through.[/QUOTE]</p><p><br /></p>

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