You guys, be sure to check your speed sensor that hooks up to the tranny. If the wiring is frayed then your odometer or trip wont work. Happened to mine. I had to buy a new harness for about 25 bucks or so. I can't remember, but this was my problem. EZ fix BTW.
On my 95 Mustang GT Convertible, the speedo works fine but the odometer and trip don't work at all.
Where do I look for the fix?
The odometer and tripmeter are driven by plastic drive/worm gears at the back of the instrument panel. These gears commonly wear out with age or the teeth simply break off. The remedy is to replace those gears and you can find them at Odometer Gear Replacement