I have only owned this car couple of months both the odometer and the tripometer on 1991 Lincoln Town Car

have stopped working. Is this only repairable at a Ford Dealer would it take a long time. The speedometer works.

2 answers
Just Google or Bing instrument cluster and you find one. Or just buy a GPS unit.
Check to see if there is a speedo. shop around, they can repair it. Or salvage dealer for used one. Maybe ebay!