To fix a non-working speedometer and odometer in a 1998 Mercury Villager, first check the vehicle's fuse related to the instrument cluster, as a blown fuse can cause these components to fail. If the fuse is intact, inspect the vehicle's Vehicle Speed Sensor (VSS), which is responsible for sending speed data to the speedometer; it may need replacement if faulty. Additionally, examine the wiring and connections for any signs of damage or corrosion. If these steps do not resolve the issue, consider seeking professional diagnosis or repair for the instrument cluster itself.
You can't fix it till you know what's wrong with it.
There is no way to change gear ratios.
Replace the instrument cluster.
It is not repairable, you should replace the instrument cluster.
These parts are only fixed by replacement.
remove the battery terminals for a minimum of 10 minutes.
There is no fixing a broken motor mount. Replace them with a new ones.
you have to keep your pen near something hot....
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.
Check fuses If you are getting power to socket, but not through it ,replace socket
You need to take it to a shop that does wheel alignments, it's beyond the scope of a home mechanic.
You would need to be more specific with your question. You are not providing enough information to supply a meaningful answer.