maustin - does the odometer work (the part that registers miles)? Is it just the speedometer needle that does not work? I imagine the needle and the odometer get their signal from the same sensor so if the odo works and the needle doesn't then I would figure it is in the speedo itself otherwise, if neither are working it may very well be the sensor.
For the techs - where is the sensor physically located on the 420SEL?

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Jim