Q: temperature gauge not working, a/c needs to be recharged constatantly

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my temperature gauge is not working, I changed to coolant temperature sensor and it still isn't moving. The thermostat is good. I also notice that my a/c is not working correctly, I seem to have to keep filling it up. Could these 2 issues be associated with each other? What do I do to fix it?

My car has 175000 miles.
My car has an automatic transmission.

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