How do you repair 91 940 Volvo speedometer odometer?

To repair the speedometer and odometer in a 1991 Volvo 940, first, check the vehicle's speed sensor, which may need cleaning or replacement if faulty. If the speedometer gauge itself is malfunctioning, you may need to remove the instrument cluster and inspect the connections and solder joints for damage. For odometer issues, often the gears inside the odometer mechanism are worn and may require replacement. If you're not comfortable with these repairs, consider consulting a professional mechanic.