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remove the battery terminals for a minimum of 10 minutes.
You would need to be more specific with your question. You are not providing enough information to supply a meaningful answer.
You can't fix it till you know what's wrong with it.
There is no way to change gear ratios.
Take it to a garage. It can leak at several places and there are seals that can be installed to stop the leaks.
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You need to identify the leak before you can fix it.
It is not repairable, you should replace the instrument cluster.
Replace the instrument cluster.
These parts are only fixed by replacement.
There is no fixing a broken motor mount. Replace them with a new ones.
Fix the leak, and fill the coolant.