Just make bench tests with two different firmwares: 1.0.3x (sorry do not record - was loaded from purchase) using Megatune from VemsMT1.0.53 package and 1.1.22 using MT from VemsMT1.1.12-pre.
In both cases temperature readings sticks at 102C in Megatune and 101C on LCD. LCD seems have 2deg step and indicate ~1deg lower than Megatune.
In addition - IAT act in same manner.
Gints.