i had replaced my gauge faces in my cluster, which required taking the speedo needle off. once i put it back on, it was accurate, but bounced a little from 0 to about 20 miles an hour. maybe somethings just loose in your cluster?
This happened to me too. At first, it looked like the circlip that holds the gear to the cable had dissapeared. It still did it after I fixed it, it turned out to be I hadn't secured the cable to the cluster all the way. If it easily pulls out it has'nt clipped in all the way.
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