A bad shorted out component in the cluster could blow the fuse which supplies power to the cluster and that would knock out everything in the cluster. A fuse protects the components on the circuit and when it blows out replacement fuses are just going to blow out again and again until you find and fix the component which is causing the fuse to blow. If everything else in the cluster is working, then I would be looking at changing the speedometer itself or the sending unit on the transmission which provides it information about speed.
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