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Q: What would cause the speedometer to not accurately display MPH? on 1990 Mercedes-Benz 420SEL

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Example: If I am going 25 MPH (as shown on speedometer) my actual speed is approximately 45 MPH. What is causing this to occur?
(2) Answers
It sounds like the speedometer on your 1990 Mercedes 420SEL is reading in kilometers per hour instead of miles per hour. If there a switch located some where on the dash to convert the reading from metric back to english units?
Thank you Jim,
I do not see any switch that can be set to kilometers or miles (unfortunately). I may scan the trans to see if the sensor that is in there is for K instead of M. Thank you for the advise.