this is so true! after getting back in trucking after a 15 yr. reset. i drive a 06 pete with a 475 cummings. no pyro. and no boost gauge? ok i know i could get better fuel milage and not over heat the turbo if i can just watch these 2 gauges. this is what i do when hauling my race car trailer with my duramax. i down shift the pete at 1500 rpm's because that where it pull's the best. i started asking about the isx motors. someone told me to lug it down to 1250 rpm's. i just cant see doing this! it dosnt seem to pull down that low and the turbo must be at 3000 dec.!! i cant understand why they stopped putting these 2 gauges in the trucks?? i think they are as importent as the oil and temp gauges.