2007 Yamaha Apex Factory Service Manual, Page 634Get this manual

2007 Yamaha Apex Factory Service Manual, Page 634

SIGNAL SYSTEM ENGINE OIL LEVEL SWITCH 1Remove: Oil level gauge 2Connect: Pocket tester (to the oil level switch coupler)
speed sensor coupler (wire harness side) as shownPositive tester probe White Negative tester probe BlackBlue Positive battery
terminal Blue Negative battery terminal BlackBlue Elevate the track and slowly rotate it Measure the voltage (DC V) of white