I took my '94 S500 into a local speedometer shop to have a broken odometer gear fixed. While replacing that gear, they broke the front bezel of the instrument cluster. After replacing that, now the speedometer doesn't work. They worked on it all day and cannot figure out why the speedometer doesn't work. They swear they never touched the speedometer. Is there some sort of reset or disconnect of power required ? Can anybody help me straighted this out before they ruin something else? Thanks to all. Mark