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If your speedometer is cable driven and not electronic, it sounds like the cable needs to be lubricated. You remove the cable from the back of the speedometer and pull out the inner cable and slide it back in while lubericating it with some speedo grease.
It would probably be cheaper to replace the cable, check with your local auto wrecker. This used part should be very inexpensive, compared to repairing it.
The speedometer is driven by the vehicle speed sensor. See "Related Questions" below for more about where to find it, and how to replace one.
Where is the starter located on a 1997 mercury sable ,and if any display a photo of the part.
where is turn signal relay located at 1989 mercury sable
On a 1999 Mercury Sable : The transaxle ( transmission ) is located in the engine compartment , bolted to the engine
On a 2001 Mercury Sable : The battery is located in the front of the engine compartment , on the drivers side
Look on inner fender--Follow + battery cable should connect to solenoid
A 1997 Mercury Sable came stock with size p205/65r15 tires. Taller or shorter tires will cause the speedometer to read incorrectly.
The ECM in a 1999 Mercury Sable is located on the inside of the vehicle on the passenger side. It is located under the kick plate.
The 2000 Mercury Sable starter will have three retaining bolts. There will be two cable retaining nuts on the front of the starter.
on the steer wheel