Hello guys, well no work today so jumped in my pickup buzzed into Mack and picked up a thermo coupler for the turbo.After some talk with the mechanics we have agreed that the boost is correct at around 30-31 lbs. We also discussed the possability of an electronics glitch but i'm not getting any malfunction light and we have scanned the system with there laptop and found nothing.Before all of this started the exhaust temp would rarely get to 900 degrees. Water temp is still 180-190, The bearing in the turbo was letting the impeller drag in the housing so we replaced the turbo still high exhaust temp so we checked the charge air cooler it was cracked down the hot side so that was replaced, still high exhaust temp air and fuel filters changed, still 1150 degrees and climbing. That is now where i'm at so now i will replace the thermo coupler. If that fails we are going to hook up Macks lap top and see what temps it will read compared to what the gauges say.