1996 Johnson/Evinrude Outboards 8 thru 15 Four-Stroke Service Manual, Page 273Get 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 SNOR
5Press the tester NO OIL buttonThe 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 WATER TEMP light should turn on, and you should find the same test results as Step 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 OILTanIYeliow Circuit WATER TEMPTan Circuit