Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 462Get this manual
IGNITION CONTROL SYSTEM CHECKING THE OIL PRESSURE SWITCH
Check: Oil pressure switch continuity Out of specification ReplaceOil pressure switch continuity pressure:
14.7 kPa (0.15 kgfcm22.13 psi) and above 14.7 kPa (0.15 kgfcm22.13 psi) and below
No continuity Continuity
Measuring steps: (1)Remove the silensor assembly and carburetorRefer to "REMOVINGINSTALLING THE INTAKE SYSTEM" on page 4-5 (2)Remove the oil pressure switch(3)Connect the mity vac as shownMity vac: YB-35956-A90890-06756 (4)Slowly operate the mity vac(5)Measure the continuity when the specified pressure is reached