Gauge accuracy??

[WOJO 1]

So here is the deal. I have an 02' and my brother has an 03'. I have the X-Monitor and he has Autometer analog. I have a smog equipped truck and he does not. Here is the question. Why would his truck, EGT wise, run so much hotter that mine? My truck, even pulling my 31' TT does not hit 1200* for where I pull it to. Even with the standard juice. His will hit over 1200* by itself in a very short WOT burst. With my juice on his truck 1350* before 5th gear is not uncommon. Both trucks are pre-turbo and the probe is in the exact same spot. Why would these trucks be so much different? Mine seems to fit with what others on here are seeing and his is sky high. His boost is also about 5-7 lbs. higher.

Any suggestions??

Thanks

[More Power]

Trade pyrometers and meters/gauges, then see if the temperature difference follows the gauges or remains with the truck.

I would expect there to be some variation between engines, but not all that much unless there's a gauge accuracy issue.

MP