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Changing the speedo might be as easy as an ecu reprogram, but the last time I saw one done ( on an '01 Tahoe ) tech spent about 2hrs between calls to Gm and various points waiting in the process just to get the special reprogram setup in gms system. Then he still needed to do the actual programming. Aside from the techs time, Gm also charges to do their side of it. The tech was doing this on his own vehicle, but for a customer the cost might be prohibitive. I'm sure there are vehicles out there easier to do this on. There also might be an aftermarket programmer for your vehicle that might allow you to adjust your speedo as you please. I guess I'm sayin check with your dealer first if you're going that route.
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