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Q: what is wrong with my speedometer? on 2005 Chevrolet Silverado 1500

the speedometer at time says at a complete stop I am stilling going 30-40mph and then when I am driving it says I am going 100mph. Please help understand what is going on.
What seems to make the problem better or worse? It comes and goes
How long have you had this problem? since I bought the truck approx. 4 weeks ago
speedometer does not sho, chevrolet, silverado 1500
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The speedometer operates from data provided via a CAN network (data network) from the vehicle speed sensor and engine's processor.

-The sensor could be faulty
-The gear driving the sensor could have issues
-The network could have a problem
-The wiring could be a problem
-The speedometer itself could have an issue.

Testing is required with a proper diagnostic tool to find out what's going on.
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