I had the same problem when I bought my 91. I replaced the speedo gear and the cable and still had the same problem. I ended up having to replace the speedometer itself. On the back of the speedometer there is the weight and the thing that spins around it. They come into contact with each other and send the needle from 10 to 140. Mine was making the same pinging noise. Hopefully you just need a new cable or speedo gear. Speedo's themselves aren't cheap.
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