Speedometer will not accurate it will fluctuate and sometimes it will not go down to zero and stop at 20 or 40 and sometimes go down beyond zero. The fuel gauge will not accurate also the needle gauge will go beyond full and will not go down to zero.
Sounds like a bad stepper motor, this is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems. Also, where you can purchase replacement parts on Amazon if you want to do the repair yourself.
Trailblazer Speedometer
Most likely the stepper motors which drive the speedometer and fuel gauge are defective and need to be replaced.
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