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Gm has had a ton of problems with the instrument clusters on their vehicles, especially trucks and SUVs in recent years. The instrument cluster is about 99.999% likely to be the cause of your speedometer problem and may also be causing your fuel gauge problem, although they have had a lot of problems with the fuel level sender in the gas tank as well. But I would get the instrument cluster fixed first. If it is out of warranty then the cost of an exchange or repaired cluster is generally around $300-400 for the part, and about 2 to 2.5 hours of labor to replace the cluster, and program the cluster if necessary.
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