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The speedo on my 172 phase 1, also stopped working.
I bought a new g/box sensor on Ebay for £5.... and it worked OK for 3 days. It then went intermittent. It usually works OK when the engine is cold though, but fails after a few miles.
I bought a second new sensor on Ebay. It also worked fine...
If your rear discs are al all worn, then its best to replace disks at the same time. You can get the new discs with the bearings pre-fitted, which makes the job really easy. Two bolts to remove the caliper, then the big hub-nut. The bearings only seem to last about 100k miles. You can usually...