1989 Johnson/Evinrude Outboards 88 thru 110 150 thru 175 models Service RepaIr Manual P/N 507757, Page 140Get this manual
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STEPPOWER
make adapter using
1 ohm, watt
11614 Connect PRV meter red lead to adapter red lead and meter bIack lead to clean engine ground5 Crank engine and observe mete