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Well, even if we let slide the fact that he cluster in question seems to use a magnetic sensor... the 1800-2400 rpm that a regular drill puts out seems to be in the normal input range for a traditional Yamaha XT-style speedo. The worm gear + pinion at the wheel act as a rpm multiplier. A typical 18" front wheel with a 100/90 profile tire spins at about 500 rpm @ 60 km/h, so even with a conservative 2-3 multiplication we're well within the few thousands rpm range.
You certainly don't want to try attaching it a dremel-type tool though, those can idle at 10k+ rpm at the lowest setting, and up to 30k rpm at the maximum.
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