1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 55Get this manual
System Check TM Engine Monitor []]System Check alerts the boat operator to any of four system failuresA dash-mounted gauge and horn combine to warn the driver of potentially damaging engine operating conditionsThe system is solid-state, water and vibration resistant, with no bulbs to break or burn out2-inch and 3-inch gauges are available2-inch gauges feature four lights only; 3-inch gauges combine the four lights with tachometerSensors on the powerhead and remote oil tank monitor the following conditions: No Oil Water Temperature
System Self-Test
Check Engine Low Oil