today i cycled the key on / off 6 times and the guage slowly came back down to normal, bad guage im guessingWhen it gets to a certain temperature, turn on and off the truck a few times, does the gauge read the same every time or does it change? If it changes as the key is off and on then it is most likely a stepper issue. They start to hang up and will give unreliable readings, sometimes you can get them to read correctly for a few months, weeks or days but turning key off and on.
Get an ODB reader and read the signal off the data bus at the connector under the driver side dash, see what the computer sees. If the sensor is sending the computer inaccurate readings you will see it on the ODB signal and would be a bad sensor. If the sensor is sending good data to the computer but the dash is all messed up then you know it is in the speedo.
Might be someone close to you to repair at a commercial place but I and others here also offer repair services for the speedometer at a pretty cheap rate.
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Electronic Repairs - Speedometer, brake, door latch, fuse box, stereo
Billet letters for tailgate and under hood
I removed my cluster and sent to Dragon2 for repair. All working great 😊on my 2004 chevy ssr the engine temp guage in the cluster is going way past hot but its not running hot per hand held lazer temp guage,is this usually a bad cluster or a sending unit? maybe loose wire?
I have pulled a couple of clusters out, and I can replace stepper motors if needed. The cluster removal / reinstall is not a quick job for me - takes a couple of hours both directions but I am happy to do it for you.