Those relays can go bad and you should be able to get them from most marine places. You can try to swap the 2 relays to see if that is the problem, but close to them there is a relay pack with 3-4 fuses, or single enclosed fuse packs (not sure when they changed them). I would check those out and if they look good, I would get out a mutimeter to check for power to the fuses and the relay. Verify that the big red botton breaker is not tripped. It should be an easy fix once you find the problem spot, and I don't know of a low oil switch on that year/model.