Motherboards don't have support for temp sensors. Do not try to plug it in anywhere.
The only thing that I can think of is the Aqua Computer Aquaero 5 XT USB Fan Controller
Read more at http://www.legitreviews.com/aqua-computer-aquaero-5-xt-usb-fan-controller-review_1813/6#1rwu5MI9Lqg3vbSW.99
Or yo can mount one of thous basic LCD readouts somewhere.