The family and I are on our last day of a 2k mile road trip to montana and back to oregon. I noticed today pulling a long grade in 90 deg weather that the temp gauge started to climb. Admittedly I was pushing it to see what it could do, but it crept up over 220 before I backed off. Normal ? I am wandering if egt's where the reason and an thinking of installing a pyrometer. Annnnd discuss....