Colin, your an idiot. The instrument panel has gone bad. Your fuel gauge is soon to follow.
This is a very common problem with Trailblazers and is caused by a fault speedometer stepper motor - the actual motor that makes your needle move around is wearing out.
You have two solutions, if your Trailblazer has 70k miles or less you can take it to your local Chevy dealer and they will replace it for you as part of a recall.
If you have over 70k miles visit my Trailblazer speedometer page here: http://drspeedometer.com/services-i-offer/trailblazer-speedometer-repair
I specialize in the repair of these units and offer free shipping and a great guarantee on my work.
The sun has bent the plastic pointer by the sound of it
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