This needs to be moved to the 1st gen section, they'll know better than us here in the 2nd gen (2015-up) section.
That said, you need to determine if the gauge is telling the truth or not. Is it actually running hot? Use a laser thermometer on the t-stat housing to see if it's running hot. If it's running normally then the gauge isn't telling the truth, so then you'd want to check the temp sensor.
That said, you need to determine if the gauge is telling the truth or not. Is it actually running hot? Use a laser thermometer on the t-stat housing to see if it's running hot. If it's running normally then the gauge isn't telling the truth, so then you'd want to check the temp sensor.