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do you actually have a scale on the knobs, or are you guessing?

Do not set the fan to stay on.
when moving it will actually inhibit air flow.

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The knobs will have a scale, and after doing some testing on my end, should be accurate to the manufacturing differences in the temperature sensors (should be very small). Standard disclaimer: all temp gauges will be slightly different, so you may have to make some adjustments to match your gauges.

I'm a bit gun-shy about just turning the fan off when you hit highway speeds. I guess I don't want to assUme that there will be enough cooling. With a temperature sensor, the controller can turn the fan on as needed.

I'll have to think about highway speeds though. Naturally, if the fan is at 90%, and the temp goes up, you don't want to slow the fan. Unless of course the fan is the reason the temp went up, and you actually need the fan to slow down/turn off. Very counter-intuitive.

Or, I could add a button similar to the one on smoke detectors: turn the fan off and ignore the temp sensor for 5 minutes. By then it's cooled off enough the fan doesn't have to turn on.