I am a 5 day old 6.0 powerstroke owner and pretty much no nothing about a diesel unless I learned it on this forum. I have an 05 F250 4x4 lifted 80,000 miles. It has an edge on the door pillar w a sct prog.. It has egr delete already done from what I can see. Truck seems to run great and every now and then the temp gauge go's hot and then right back down. Ive tried to figure out some kind of pattern but cant. In the drive a minute ago I let it idle for ten min and no problems. Rev motor to 1200 rpms and watched it climb and then right back down. Did that again and nothing even at 1500 rpms. No smoke black or white. I dont know what the temps should be on the edge gauge ect.. I love the truck but will get rid of it as fast as I got it if need be.. Any advice??