I noticed my temperature gauge was rising over the normal 210 when accelerating and began playing with things from there. The truck runs fine and shows no signs of overheating other than the gauge. I have replaced the thermostat with a duralast one from autozone, the ect sensor and plug, I have done a coolant flush and out new dexcool in to the correct level. The gauge goes high when accelerating and sometimes will completely drop to cold. The temp runs normal in park and while driving at normal speed at lower rpms. I do not see any signs of leaks. Also my change engine oil lights keeps coming on after resetting and changing oil. No engine codes and I’m losing my mind.