coolant temp switch

[Dnyce]

so, i know alot of ppl just add a toggle switch inline when their stock coolant switch goes bad, or when they want the power to turn the fans on whenever they want, but what i want(and what makes the most sense imo) is a fan switch that switches on at a lower temp. i cant imagine that every fan switch comes on at the same temp, or at the very least someone would make an adjustable one for custom applications. but i cant find any info on it. anybody here attempt to do this?

the bike is a '00 750, but this would apply to all bikes id think.