I had a temp gauge & pressure gauge all picked out & bookmarked & never ordered them, I simply forgot. A member had a metric liquid filled temp guage pictured on this site @ one time.

I'm not sure but I think it was this one...(white face)
http://motorcyclecity.com/Parts/Horns___Gauges.html
or (for Blk.)
http://www.jcwhitney.com/autoparts/Produ...Ntt=oil%20gauge

another one:(call first & ask about metric fittings)
http://www.dragspecialties.com/fatbook/index.shtml

Install:He simply found a bolt in bottom end to screw in the fitting & presto it was done. It looked great!