Hi,
It sounds like you have a short to power. The speedometer receives a signal from the vehicle speed sensor located on the transmission. If it is staying at 3 most of the time, something is sending power or a signal when it shouldn't, or the instrument cluster has an internal short.
If you look below, I attached a wiring schematic of the instrument cluster. I highlighted two wires I need you to check for power when the vehicle is not moving. One wire is green and the other is green with a black tracer.
Simply disconnect the connector and check those pins for power. The key will need to be on.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Let me know what you find.
Take care,
Joe
See pic below.
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Monday, October 31st, 2022 AT 6:47 PM