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Alan Moore wrote:There is an ajustable potentiometer inside the speedo. So you need to check the car against a GPS etc and find that 70 equals 80 say, then the speedo would need to be removed and a square wave pulse inputted, at a frequency to arrive at the figure of 70, then adjust the pot make the speedo read 80. Any instrument repair shop should have this equipment.
I did this myself in the electrics room at my workplace.
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