1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 268Get this manual
WATER TEMP Circuit 1Separate the connector between the engine harness and the temperature switch 2Using jumper wire, connect the engine harness tan lead to clean engine ground3Turn the key switch to ON positionAfter the normal self-test sequence, the gauge WATER TEMP light should stay on If WATER TEMP light is not on, troubleshoot tan circuit for an open in the engine harness or the instrument harness4On engines, test both temperature switch tan circuits 5To test the temperature switch itself, refer to Temperature Switch, Section 46Turn the key switch OFF and reconnect all circuits disconnected during these testsLOW OIL Circuit 1Remove the four screws retaining the pickup assembly to the oil tank
[] 2Turn the key switch to ON positionlift the pickup assembly out of the tank and hold it uprightAs the float drops, the gauge LOW OIL light should turn on[]] If the LOW OIL light does not turn on, disconnect the tank pickup 2-pin connectorConnect the two terminals in the engine harness connector together with jumper wire If the LOW OIL light turns on after connecting the two terminals together, repair or replace the oil tank pickup assembly Ifthe LOW OIL light does not turn on after connecting the two terminals together, troubleshoot the tanblack and black circuits for an open in the engine harness or the instrument harness3Turn the key switch OFF and reconnect all circuits disconnected during these tests