How do you fix a speedometer that is not working on a Renault extra van?

To fix a non-working speedometer on a Renault Extra van, start by checking the vehicle's fuse related to the speedometer circuit, as a blown fuse can cause it to malfunction. If the fuse is intact, inspect the speed sensor located on the transmission; a faulty sensor may need replacement. Additionally, examine the wiring and connections for any damage or disconnections. If these steps don’t resolve the issue, consider consulting a professional mechanic for further diagnostics.