1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 305Get this manual
If the gauge lights do not turn on or if the warning horn does not sound for 12 second, test the gauge and wiring as described in Circuit Verification, Instrument Harness, this section3To test the instrument harness warning circuits, turn the engine key switch to ON position[] 4Move tester TACH ONOFF switch to ON position[] 5Press the tester NO OIL button The gauge NO OIL light should turn on for 30 seconds, and the warning horn should sound for 10 seconds6After waiting for NO OIL light to turn off, press the OVERHEAT button The appropriate light should turn on, and you should find the same test results as Step 5Then check the CHECK ENGINE and LOW OIL circuits If the gauge lights do not stay on for 30 seconds, troubleshoot the instrument harness gray circuit for an open If one or more gauge lights do not turn on, troubleshoot the corresponding circuit for an open in the instrument harnessNO OILTanlYeliow Circuit WATER TEMPTan Circuit CHECK ENGINETanOrange Circuit LOW OILTanBlack Circuit Tachometer Function 1Turn the engine key switch to ON position[] 2Move tester TACH ONOFF switch to ON position3The tachometer should read above 3000 RPM If the tachometer does not indicate this reading, check the instrument harness gray, black, and purple circuits for an open If the gray, black, and purple circuits are ok, replace tachometer nUM