RPM is useful if you’re trying to find the gear and you need it to keep the Mychron working. Also some times when I come out of a corner I check the rpm to see if it was a good line or corner.
Head temp not totally necessary on the 206. You can’t remove the washer on the spark plug on a 206 so you can’t replace that with the head temp sensor. There’s no way to change the temp and from what I’ve heard most run on the colder side anyways. Might be useful on engine break in to monitor but just dont be a bone head and you’d be fine.
You can go crazy with your data but as far as the engine, very little to monitor on the 206.