Could be that speedo cable has become disconnected or that the inner shaft has broken. The speed cable is connected between the back of the instrument cluster and the left side of the transmission. Check under the car that the cable is securely fitted to the side of the transmission. Disconnect it and and check on the condition of the square drive flexible shaft. The spinning of this inner shaft is what conveys the output shaft speed of the transmission to the instruments. The instrument cluster can be removed but pushing a length of coat hanger wire with right angle turn on its end between the the cluster and the dashboard surround. Turn the coat hanger to hook behind the cluster and pull forward to remove it. Try several points around the cluster. It is best to disconnect the speedo drive cable to withdraw the cluster (after electrical connections have been disconnected. check that the speedo cable is secure to the back of the instruments. If you remove the cluster completely follow the path of the speedo cable. If you have to replace the cable, tying a length of string to the speedo cable end first and posting the string down the cable path will help the re-installation enormously. Simply pull the string whilst reinstalling the instrument cluster until the end of the speedo can be got hold of. Refit the speedo cable to the transmission only after the instrument cluster is back in place.
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