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When I bought my first car, the speedometer worked weird. I was told the plug into the gauge cluster needed to be lubricated and when I took it apart and blew in some graphite, it did not bind up at all!
It did not do anything, it was not fully plugged in, so my speedometer did not work until I redid it. People told me to just go off my tachometer, but I think each day I drove a little faster, and when I fixed it, it appeared I had been driving 75 on city streets.
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