Check on the end of your wiper control arm. There should be a toggle like switch that allows you to change the function of the computer. It sound like you are in the screen that shows you the MPH you are getting at that point in time. The lines you see inticate that the computer cannot display the results it is calculating. This usually happens when you are at full throttle of totally off the gas. Try scrolling through the screens and see what you can find.
Let us know how you make out.
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