1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 162Get this manual
Water Temperature Sensor Test
Measure resistance of sensor
Sensor Resistance 77 (25 C) 9851015
Water Temperature Switch Test
The switch must react to changing temperature as follows: Switch Closed240 (116 C) Switch Open207 15 (97 C)