On my way home from LA, my speedo quit working. I assumed it was the speedo cable, but when I replaced it this week, it was still making a terrible noise. I decided to pull the cluster again and use my old cable in a hand drill to see if it would duplicate the noise. Sure enough, the cluster itself started making a terrible racket and wouldn’t display speed. The needle would jump around a little, but mostly just made a lot of plastic grinding noise.
I had previously suspected that the displayed mileage (36,000 km) was incorrect. This info supports that idea, and the cluster was probably rolled-back and tampered with at some point.
Either way, I am going to replace the cluster with a donor that includes tach. I’m still looking for the right cluster. I had originally planned on using a Canadian-spec BJ70 cluster because they include MPH (and RPM), but have since realized that the mounting tabs and electronic plugs are different.