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How can I get my Renault Megane onboard computer to work fully again?

I recently had the tensioner and belts changed on my 1990 Renault Megane Coupe Sport. Since then the computer has stopped displaying the mpg & miles left before refueling. Any ideas to what might have gone wrong and how to sort it?
HB, December 2009
link Click here to see other fixes for Renault Megane.