If the speedo isn't working, start by checking the vehicle speed sensor (VSS). As far as the actual speedo, if repairable, it will need sent to a place that fixes them. Not something 99% of people can do.
Nov 20, 2011 at 5:53 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.