The speedo & tacho on mine either stopped working or jumping intermittently few years back.
I opened it up & cleaned the electrical connections with a tooth brush or piece of cloth or something and put it back.
It has never given me trouble since then. I've been wondering whether trip meter and odometer issues might be the same(other than mechanical issues with wheels, etc). AFAIK, in mine, there are no mechanical cables that goes to the back of the instrument cluster for the trip and odometer.




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