I'll post screenshots tomorrow after I've gone to the hangar again, but it is an experimental aircraft, not LSA. I did load the dfg file from the other thread but it has nothing to do with the number of RPM inputs, only how RPM is calculated.
The engine is a Rotax 912ULS. The engine RPM gauge has one coloration range for when oil temperature is < 120 degrees and a second range for when temperature is >= 120 degrees. I'm guessing that's why it's locked down, maybe it's a special hard-coded function for Rotax engines?
Here is an excerpt from your own setup manual (pay particular attention to the last sentence):
"Setting ENGINE TYPE to ROTAX 912 pre-configures some engine settings for a Rotax 912 engine. SkyView will automatically configure and dynamically change the oil temperature and tachometer scales and alert thresholds in accordance with Rotax’s recommended ranges, described in detail below.
When this mode is selected, EMS SETUP > SENSOR SETUP > OIL TEMPERATURE AND TACHOMETER settings are unavailable."