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I'd start with a cold reading to verify both are close in temperature to say... they work.
Next is the connector, mine does this occasionally, wiggle the connector, readings change. Next boil the t-stat and verify the fitment with the housing in the pot with the T-stat... go from there, its good or bad, doesn't fit, won't fully open/close or you have a connector issue.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.