you cant repair it you have replace the whole thing because its one little pice inside of the odometer mine is broke also You can get the small gear that is broken and full instructions on how to replace it here:
how do you change a water pump on 1993 Mercury Cougar
A 1993 Mercury Cougar takes ( DOT 3 brake fliud )
What type of freon does a 1993 cougar use
The gears inside the odometer broke due to heat and age. You can buy the gears and replace them yourself. Or you can take your car to a place were they work on odometers.
In the trunk
You're going to have to replace them. Find yourself a good manual that details how to remove your dash, and pray you don't loose anything.
embedded with alternator
the orignial price was $17,890
.040 ========================================================== According to one of Fords websites : For a 1993 Mercury Cougar : The 3.8 liter V6 engine and the 5.0 , V8 have spark plugs gapped at : ( .054 inch )
A button inside the glove box.