Warning buzzer on Johnson Fast Strike 150

I recently purchased a 1995 Ranger 361 with a Johnson Faststrike 150. Recenly, the past few times I have gone out when I start the motor I get an intermitment light warning sound from under the dash. How do I find out what this means. It sounds like a warning chirp and is intermitment, more noticeable at idle. The motor sounds fine, and runs well. 20 pounds of water pressure at WOT.

Any suggestions appreciated.

I assume this is a 1995 Johnson?

Pre-System Check (1995 and earlier) warning sounds are:

1. short beep every 20 seconds = Low Oil
2. 1/2 second on and 1/2 second off beep = NO Oil
3. Constant beep = Overheat
4. Constant beep but goes away when you back off the throttle = Fuel Delivery problem