Leave the instrument cluster and bezel intact. Remove the driver side A/C duct from below the steering column if the truck has A/C. Reach up behind the cluster and remove the cable from the speedometer by pushing the retaining tab toward the cluster with your left thumb while simultaneously pulling the cable away from the cluster with your left hand. Maneuver the cable down below the dashboard. Use needlenose pliers to grab the end of the cable and pull it out of its casing. Wipe the cable clean with a disposable rag and inspect the cable for obvious wear, broken strands and kinks. If the cable is obviously kinked or damaged in any way replace the entire assembly. Liberally smear the cable with lightweight lithium grease as you slip it back into its casing making sure that the cable doesn't pick up any grit or debris off the cab floor in the process. Then reattach the cable to the back of the speedometer in the reverse steps of removal.