On Original, Classic, and Next Generation 737s, the APU panel has an EGT (exhaust-gas temperature) gauge below the four APU caution/warning lights (all images in this question are from the 737 Technical Site).1
Original / early Classic APU panel (Garrett 85-129 APU):
Later Classic APU panel (Garrett 36-280 or Sundstrand APS-2000 APU; the NG uses the Allied Signal 131-9(B), whose panel lacks the ammeter gauge but is otherwise identical):
In contrast, the 737 MAX, although it uses almost exactly the same APU as the NG (still the [now Honeywell] 131-9(B), just with minor bugfixes), lacks the NG's EGT gauge:
Given that knowledge of EGT is important for flightcrew awareness of an APU overheat or other malfunction, why was the EGT gauge removed from the MAX's APU panel?
1: Also visible in these two photos is the APU ammeter, present only on Originals and Classics.