I have a 1996 Merc. 225 hp engine. I get a beep-beep... alarm for about 1 minute when I first start the engine then it stops, and I will not get the alarm for the rest of the day. The engine is getting oil because I check the level in the tank on the boat. The tank on the engine stays full to the top. I was wondering what could cause this alarm to sound and then stop for the rest of the day. The alarm will sometimes beep even before I start the engine and will stop after the engine has run for about 1 minute. To test the alarm, if I turn the tank on the engine upside down while the egine is running will this make the alarm sound?