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Originally Posted by Shoebox
So any ideas at all most appreciated. Thanks.
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Start by disconnecting the GPS module from the speedometer. That will isolate the two and allow you to determine if the issue is in the speedometer or if it's the GPS module.
I'm assuming the GPS is not powered when the key is off, which would lean me toward the speedometer being damaged internally.
Which would then lead me to ask how did it get pegged? Did something break in its needle mechanism, or did the GPS provide an erroneous signal that caused it to max its MPH and subsequently damage the speedometer?