1993 Acura Legend

Electrical problem
1993 Acura Legend Automatic 80000 miles

The speedometer was working fine, then out of nowhere it read 140 ( the max speed on my speedometer ) and then went to 0 and then 50 and kept shifting around, it eventually began reading the correct speed, or what I'm assuming the correct speed was. What can I do to fix this at a reasonable price?
May 18, 2009.

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