Odometer not working 1996 Ford Crown Victoria

Sounds like the speedometer head. its cheaper to actually replace it rather than repair. find one close to your mileage . usually around $50.00

Did you check the fuse?

Could be faulty wiring from the VSS (Vehicle Speed Sensor) that is mounted on the transmission and runs up to the speedometer.

This is an internal issue and the speedometer must be removed and repaired. There are people who still do this and can rebuild your old unit. Look in your area or there may be places to ship it to. Local salavage yards may have it if down time is an issue. Be sure to save the receipt in the car so that actuall mileage can be verified.

2005 Taurus Odometer not working. eveything else works

Since everything else is still working, your odometer just crapped out. This is very common on the Vics/ Marquis that utilize the mechanical style odometer. I've had two of them (1989 and 1991 Grand Marquis) where the odometer failed. You will need to remove the odometer from the instrument cluster and either replace it with a new unit (good luck with that) or send it out to be repaired. There's a guy that does this specific type of repair, search the Internets and you'll find him.

Side note: Since it was only the main and not trip odometer that failed on my two Panthers, I learned my lesson the second time around and just kept track of my mileage using my trip odometer and a pen and paper in the glove box. A lot easier than tearing the dash apart at the time. If it happened now on my current car ('94 Vic LX), I would fix it. It's not a really hard repair if you know what you're doing or can find someone who does to give you a hand.

Sounds like the speedometer head itself has failed or is in the process of doing so. While it may be possible to obtain just a speedometer head it would be far easier and probably cheaper to go down to the local salvage yard and get yourself a whole new instrument cluster. Many times they will come with instructions for resetting the mileage to match your car, if it doesn't, just attach a drill to the connection point for the speedometer cable and run the drill until it has the right mileage.

Either the speed sensor,or the dash cluster is of fault. Have Auto Zone test the speed sensor,if ok ,,, I would replace the cluster ( buy used ) much cheaper.
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U will need to pull the speedo head out and send it in for repair, there are no parts availiable to the consumer, only authorized Ford repair stations, that is not the dealer, check the internet, I use DNA speedometers.com

Since your speedometers work, the problem is in the gearing to the trip and mileage odometers. Simple problem, major pain to fix but, remove instrument cluster - you'll have to remove speedo cable to get it out. Use the old Mark I eyeball to check for broken parts. Might even have to drop steering column - disconnect air bag first!