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What is wrong with my gauge?

I have had my heater core replaced 3 years ago every since then I have been having problems with coolant system. Now my temp gauge is going crazy and I hve a pinhole leake somewhere that no one cant detect even with the pressure test and now I hear like a burping noise when I turn my car off or while idling. Please someone help.
Goldie, February 2014
Head gasket?

cdc, February 2014