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Hello. You should scan for codes first. Usually the VSS will cause a fault code, but not always. It would also likely cause shifting problems in addition to the speedometer malfunction. To answer your question though, The VSS is located on the top of the transmission. I will attach an image.
I would like to know, when this happens, and they stop working, if you bang on the dash, do they suddenly come back to life? You may have a bad connection at the cluster. I would advise checking all connections well. The VSS should have no effect on your engine RPM.