You didn't say if you bought a after market or a factory gauge, if you bought a factory gauge you need a different sender for a gauge and you can't use the factory harness in your truck as it was made different. You have to run it seperate, and the same with the after-market gauge. Hope this helps
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Andy
71's Are for ever!!! or 67,68,69,70,72
http://geocities.com/chevy71tpi/main.html