(Courtesy of PurEvo)
"
To set the shift light to either continuously on or blink and RPM setting:
First, Put your key in the ignition but don't turn.
Push and hold the selection button, then turn the key ignition on.
After everything loads up, push the adjust button to choose light on or light blink.
When you have it set to whichever you want, push the selection button again.
Now push the selection button again and the RPM needle will move.
To move the needle, push the adjust button (and keep pushing) to go to which RPM you want.
After you have it set, push the selection button."
And that's it, Your shift light is set.