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What is your question?
while driving my odometer slowly continued to gain speed as I traveled. It continued faster until it couldn't go any higher. When I stop the engine it drops back to around 90mph and then proceeds higher as I start moving
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The instrument "cluster" will need to be removed from your 2005 GMC Sierra 3500 and sent to a shop specializing in electronics repair. If you wish to do this yourself, make sure you have your cluster repaired, don't accept an exchange unit. An "exchange" cluster will need to be programmed to your vehicle.