not much. The sensor is on the coolant res. I'm pretty sure there's a grommet or washer you should replace when putting the new one in, but the dealer/partsource will know that.
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff