If you got a circuit to do that, its not going to be very noticeable. At 1200 rpm, that LED is blinking 10 times per second. That is going to be barely noticeable. At RPMS above that, its not noticeable at all. It will grow brighter and dimmer, but thats all.
If you want to make it blink, you'd need to use some sort of computer control like an Arduino.
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