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Since speed quickly translates into temperature due to air flow, why not just use a temp sensor? That way they're only on when the radiator needs them... which is rarely at speed.
Alternately, you could do an aftermarket speed sensor to turn them on and off. I suspect JC Whitney or other catalog-type place offers an add-on speed warning kit of some sort. Just use the output of the warning to kick over a relay to the fans, using the NC off the relay as the feed (so when the relay kicks over the feed loses power).
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