I've litterally just removed a set from my Extreme.
They are a fairly old style of mercury guages, I guess they were new with the boat circa 1997/8.
The set includes;
Water Temp (or pressure - would have to check)
Don't want much for them, money to cover the cost of postage would suffice.
Or if you want new... http://www.cpperformance.com/c-11-ga...cessories.aspx
I brought my new gauges from here. Postage was quick and they look amazing!