2006 ETEC 60hp no oil alarm

[Blue_Runner]

Hey guys, I have a 2006 60 hp etec on my pontoon boat. When I took it out of the water the no oil alarm showed its ugly face. It has the oil tank under the cowling, which was nearly full.

I'm wondering if anyone knows what might cause it and what might be involved in fixing it? Also, if is complicated, wondering if just disconnecting the oil injection and going with premix might be an easy option on this motor?

Thanks,
Blue