I found a sensor point on the TriCool fan! I took the sticker off the TriCool I took out of the rear of my case and was poking around on it with an LED. I found a hidden spot where the LED flashes as the fan spins (this is where the RPM wire is usually tied into). I found it for you, now it's up to your soldering skills to add a wire (it's hidden behind the plastic a bit, but if you don't mind dremeling or cutting the plastic you should be able to tack a wire on with a soldering iron). It works best with the switch on level 3 (all the way on) which is what you'd use with a fan controller anyways.
Solder your sensor (yellow) wire to that solder pad and then use the red and black wires from the Molex connector to make your 3-pin motherboard/fan controller header. Leave the switch on 3 and hide it away (or you can find out the position and solder it but that may be tricky). You should have a TriCool that can be controlled with a fan controller now.