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pyrometer temp seems high


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my 2000 mack rd with a 400 18 speed has a pyrometer temp that is running between 600-900 degrees while accelerating. i put a thermometer gun to where the sensor is in the pipe and it was reading the same as the gauge in the cab. turbo temp was around 725 at the time that i pulled over to check when the pyrometer was reading around 850. the temperature quickly drops while i start slowing down or run the truck around 1300 rpms. gauge says to not exceed 1100 degrees. is my truck running hot? 

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