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Usually the speedometer problem occurs when the battery goes dead with the key in the on position. Then when the vehicle is jumped with the ignition in the on position the needle jumps around and sticks. So never jump a dead battery with the key in the on position.
If your speedometer or other gauge sticks you can try a couple of things to fix it. The first of course is to brain dead the computer by disconnecting the battery and touching both cables together. If that doesn't work the next step is to find someone with a Tech II or GM scanner. The Tech II scanner has the option to cycle the gauges. This will reset the gauges and sometimes it works on a stuck gauge and sometimes it doesn't.
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