you can use a tuner like procal or flashpaq to disable tpms but sometimes , even on JK's that have long had the sensors removed , will experience what you are from a wire on the harness from clockspring being time-worn or rubbed it's insulation off from daily drive vibration.
also, gps , Bluetooth devices , lowrance , misc RF frequencies can cause the thing to flash but yours ( w/ tht dash section illumination fading or waning) sounds more like bad wiring. Have you cleaned & maintained your battery terminal posts / clamps & verified it's condition for the Winter?
hope that helps.
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