You would need to be more specific with your question. You are not providing enough information to supply a meaningful answer.
remove the battery terminals for a minimum of 10 minutes.
You can't fix it till you know what's wrong with it.
There is no way to change gear ratios.
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Replace the instrument cluster.
It is not repairable, you should replace the instrument cluster.
These parts are only fixed by replacement.
To fix an oil leak in a 1999 Mercury Villager, first identify the source of the leak by inspecting the oil pan, valve cover gaskets, and oil filter for signs of oil. Clean the area around the leak and replace any worn gaskets or seals as needed. If the leak is from the oil pan, you may need to remove it to apply a new gasket or sealant. After repairs, refill the engine oil and monitor for any further leaks.
There is no fixing a broken motor mount. Replace them with a new ones.
You would fix it by replacing the instrument cluster. The speedometer itself may not be faulty, it is more likely to be a problem with the speed sensor.
My 1999 Mercury mystic was in a accident ad afterwards the the body shop repaired the damage the air will not work after it was charged. what can be done to fix the air
Check fuses If you are getting power to socket, but not through it ,replace socket