This may be an example of where an oil pressure switch would be better than an oil level switch. Assuming the pressure switch was on the output side of the filter it would immediately alert you to an oil flow problem. A level switch in the sump would most likely be slower in alerting you.
I don't know? Many have reported over the years of this Forum (seems on-going..?) -- their red oil-light coming-on and them pulling over and stopping the engine to check it out. Seems to happen in a fairly punctual time-frame from all the reports?
Our FJR's have an oil level switch. No doubt a cost saving for Yamaha.
And so have many Yamahas for about 30 years.... Maybe?, Yamaha would've satisfied many more Forum FJR riders by conforming to the riders' past experiences (oil
pressure lights)...? I tend to think Yamaha had valid reasons for their engineering decision for an oil level indicator. I doubt that cost-saving was one, tho -- I tend to believe that the float and switch assembly in the sump costs considerably more than a simple pressure switch in an oil galley?