Yeah 1500 degrees is something to worry about especially if it's doing this without a load or being worked hard. I would revert it back to the stock tune and see what happens.
Do you have a real pyrometer in the truck?
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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