I am adding a water temperature gauge to my '06, REV 600 HO sdi and I need to know what the inside diameter of the front engine outlet hose is so I can order the correct hose adapter to house the sending unit. Does anyone know what this is...???

Are you adding an aftermarket gauge? Why not use the Ski-doo one? That way, all you have to do is mount it in the dash and then plug the wire harness in the the existing plug...that's it! Some guy over on Dootalk is also selling digital readout temp gauges (http://www.dootalk.com/dtproducts.php).

Yes, aftermarket, same type (cyberdyne) as being sold on DooTalk. Like the look of the gauge as compared to BRP brand. Cheaper to order parts locally than to order and have shipped from the guy on DooTalk (I'm located in St. John's, Newfoundland, Canada)...although he is getting good reviews on his kits....