The issue can be the rear wheel speed sending unit or the dash receiving unit. The sending unit can be checked with an electronic mulitmeter. There is a plug junction in the rear of the car. Rig up wires to intercept the voltage signal from the plug. The voltage should smoothly increase with the speed of the rear wheels. If the sensing unit is sending voltage, the problem is in the instrument cluster. The instrument cluster is not difficult to remove, just a lot of hidden screws. Once out, you can test the instrument cluster by applying voltage to the contacts to see if the speedometer responds. [There is a specialty backyard shop for speedometers in West Los Angeles.] You can find replacement clusters from on line salvagers from 100-200$.
Monday, April 28th, 2014 AT 12:50 AM