2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 736Get this manual
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Section 02 ENGINE Subsection 04 (LUBRICATION SYSTEM)
If the oil pressure is good, check the resistance of the oi pressure switch
5 Start engine Read result and compare to table RESISTANCE