Well, I just installed two of them in two similar sleds, an 06 600 fusion, and an 08 600 shift. The shift also got an slp pipe and can, vforce reeds, and an slp air horn. I installed the probe per the Koso instructions, "for a single pipe, 4" from the piston skirt." The results were a bit frightening. With throttle postions in the "low to mid" range (normal riding) I was seeing temps that would exceed 1300F with 440 mains, and the needle in the 3rd position, per the slp instructions.
My point is, this seems really warm. However, on the 06 600 fusion, with stock exhaust, slp airhorn, 410 mains, and the needle in the 2nd position (from top) which is the way I've been riding it for two years with almost 2500 miles, I was seeing temps over 1350F. (I actually have the slp pipe and can for this sled too, but after seeing those temps on the shift, I was scared! Figured I would only burn one down rather than both of them.
In retrospect, I would rather have just listened to SLP's jetting advice and not put the Koso's on. Sometimes ignorance is bliss. Now I'm fixating on the egt's and leaving pinch marks in the seat.
I got some advice after the fact on the probe placement, that suggested puting as far from the piston skirt as possible without putting in the exhaust stream of the other cyl. This is hard to do on a stock Polaris Y pipe. To be effective in this placement, you'll need the "weld in fitting" for the probe, as the clamp version will not hold without grinding on the web between the two pipes and then rewelding. Either way, you're welding.
