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Having problems with my 97 speedo too. If you search through this forum you'll see that there are a few things it could be. Some have reported wear in the gear of the sensor at the transmission, others a problem with the speedometer itself, and some a wiring problem. There are some steps to narrow it down, but you'll have to search for them. I haven't had the time to work on mine. I think mine is a gauge problem since if its not working and I'm going 40-60mph I can bang on the gage cluster and it will start working again. It is also very peculiar that if the speedo is not working, the auto transmission will not shift into overdrive. Again with some searching I found some schematics as far as the sensor, speedo, and computer that could help me with my answer, but not enough time to spend on it. Is yours an auto and does it do the same as mine?
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