Yeah, one of the slickest ones I've seen is the little Raptor light. It is about the diameter of a ballpoint pen, and about 2-1/2" long.
By removing the vent grille (two screws) and drilling a hole in that flat area to the left side of the grille, the little light can be inserted there out of sight. But, believe me, you'll not have any trouble seeing it in broad daylight!
Easy to set up and just a couple wraps of tape around the barrel wedges it in place to stay until you want to adjust it, which only requires it be pulled out an inch or so to access the "click" dials.
In the picture you see it giving me the "Hello! I'm ready!" signal at power up. When you make a setting adjustment or change to same, it will first flash the 1000s rpm setting, pause, and then flash the 100s settings. 7 flashes, pause, one flash and I know it is now set for 7100 rpm (which seems to work out pretty well for me and my setup).
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