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Speedo and Odometer is way out (around 30%)


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My speedo seems so far out and the odometer is also clicking the equivalent extra. Any ideas on what the problem or solution could be please?

This is what I am showing on the speedo and what the actual speed is (checked on gps). Speedo reads 43 mph when doing 30mph, shows 58 mph when doing 40mph, 70mph equals 50mph, 85mph equals 60mph, 98mph equals 70mph, 114mph equals 80mph and 119mph equals 85mph.

Running standard wheels and tyres. I have a 2.5L 1998 tiptronic RHD and am based in the UK

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