I've got a 225 HP Optimax that started beeping at me over the weekend. Shortly after shifting into gear, I get 4 loud beeps. Then every few minutes after that, I get 4 beeps. Water pressure is normal, oil level is fine, amp meter showing 13-14 amps. Not sure what else to check. The only abnormalities I noticed are that the speedometer is stuck around 45 mph, but it's done that before and later returned to normal, and the tach is stuck around 600 rpm. Can anybody tell me what the 4 beeps mean? I left the boat at the lake and won't be back for a few weeks, but I won't plan to run it again til I get it in the shop, unless it's something minor that I can fix.