Overheat alarm on Evinrude

[bradford]

Maybe one of you fellas can point me in the right direction before I spend any money or make something worse. I'm getting an overheat alarm immeadiately upon start up with a cold engine. The engine ran great last time a used her, about 1 1/2 months ago. Went to crank her up in the driveway and am getting the alarm. I'm getting plenty of psi on the gauge and a solid piss stream out the back. I'm thinking maybe a bad connection or ground maybe? The engine is a 1990 Evinrude 225 looper. Any advice is much appreciated.