get it off RRM website, I believe they have the nicest one. It's CF, and it has good fitment. You can find some from the ebay for half the price, but you get wha you paid for, and I believe it's not direct fitment, have to work on it to make it fit.
Also, epods.com or something makes ones for the plastic behind the steering. You can put two gauges there.
It's not like you can find used one from a member for alot cheaper than new ones from those sites, just go new and spend 10 bucks more.