John, Tx for the explanation. However, I still see a problem. I have read both offstes 0x08BE and 0x3B70. They produce approx the same values after conversion. I am still not able to use the conversion formula to reconstruct the readings on the DU of the PMNDG737-700. Furthermore, when N1 goes over approx 30%, with increasing power, the EGT displayed on the DU rises slowly at first, then faster at higher powersettings. The offset values from both offsets decrease in the same way a bit before they become constant, only to rise a little bit at full power. It seems to me that no (lineair) calulcation can generate higher EGT values from decreasing or constant offset values. So I am still at a loss. Would you mind looking into this problem once more? Thanks a lot.