Cory M. 4/1/2010Sounds like something is wrong with the circuit board behind the instrument cluster (Speedometer). You can replace the circuit board, but with all honestly, I would just get a used or new instrument cluster, from a junk yard or Ebay.
cougardenny 4/2/2010I bought an instrument cluster from a local junk yard. First, I replace the circuit board, but it didn't work; therefore, I put the old circuit board back in and replace the speedometer unit, and it works. Thanks