I just went up in size from the stock 31's to 33 (275/70/18) terragrapplers. The new tires are running about 54psi.
But now my tire pressure gage warning keeps going off. Is there any way to reset it for the new pressure?

thanks

 

Just because you went up in tire size doesn't mean you need to increase your air pressure. I would stay within 3-5 lbs of what the door jamb says. Probably stay in 33-38psi range.