2000 21SS Extreme with a 200 Evinrude Ficht. The alarm that goes off when you first start the boat or have low oil or something else is no longer working. I know there are four plastic canisters under the dash connected to various wires. 2 are red and they look like shotgun shells, one is yellow and it looks slightly larger than a shotgun shell, the last is red and the size of a large soda cap.

What should i check or am i even looking at the right thing?