Why do people think the probes etc are too heavy? A Rotax 912 comes with most of the probes as standard and adding coolant temp and EGT’s adds very little weight. Most of the Rotax powered machines I know are very well monitored with 2 X EGT, 2 X CGT, Oil Temp, Oil Pressure, Water temp, volts, and in some cases fuel flow. It is the old stuff which is reliant on out of date tec. It is true that most instructors find all this info confusing but adequate engine monitoring is a huge help in preventing a small issue growing into a failure.
Rod1