Pandajama

I have a 1985 Coupe Gt that I have had since 1985 after purchasing it in Germany. I have 240,000 miles on it and just recently the odometer went out and the electric clock is intermittent. I need an instrument cluster or some good ideas on how to fix these problems. I believe that a gear in the speedo may be bad. The speedo does work. Any assistance would be appreciated.