To change MPH to KPH multiply by 1.60934.
If you are referring to a particular make and model of car dashboard then more specifics are required.
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To convert from mph to km/h, multiply the mph value by 1.60934. For example, if the speed is displayed as 60 mph, you would multiply 60 by 1.60934 to get the speed in km/h, which is approximately 96.56 km/h.