2008 Evinrude E-TEC 55MFE Technical Manual, Page 179Get this manual
COOLING SYSTEM ENGINE TEMPERATURE CHECK
ENGINE TEMPERATURE CHECK
IMPORTANT: The engine temperatures listed
below are based on an intake water temperature of 70 10F (21 3C)Install correct test propeller and place outboard in test tank or in the waterStart outboard and run at 3000 RPM in FORWARD gear for at least five minutesRemember, running outboards at high speeds in test tanks may disrupt water flow to gearcase water intakesMake sure the outboard has adequate water flow
Software Method
Use Evinrude Diagnostics software to read temperature displays