I'm a retired mechanical engineer, I've built everything from minibikes to racecars, but that doesn't mean I know anything. Seems to me the short thermocouple on that little guage will get fresh oil splash almost continuously when the motor is running, the temperature at that point is a good measure of whats going on in the crankcase. It will always give you the most optimsticly cool estimate for the oil temp in general. And remember, def F is simply deg C divided by 5, then multiply by 9, then add 32. While riding my bikes I keep an eye on the oil temp guage, I have a hotrod, it has a VDO oil temp guage. The temp of the trail's oil is just about the same as the temp of the hotrod motor... around 105 deg f typically, depends on your climate and atmosphere