I picked up these logo barbell tongue studs from eBay and
"pierced" my speedo cluster ring with them.
Easy and cheap way to add some bling to your gauge, Just drill a 1/16" hole in the little dimples ( Thats got to hurt on a tongue

) the top one has to be cut down as there is not enough room for the stud. They cost from $2-$5 each shipped there are hundreds of different ones to choose from. I got mine here.
http://www.bodycandy.com/cgi-bin/category.cgi