Yanmar YM oil pressure alarm failure
The other day my oil pressure alarm failed. This is when starting and stopping the engine, the light should come on and the audible whistle activate.
I had this on a charter sailboat recently, too, and then it suddenly self-corrected.
Mine self-corrected too, by flipping the ignition switch from OFF to ON several times (engine not running!). It faltered at first, the light sputtering and the alarm sounding "dirty" and weak, and then suddenly they were both fine again.
I had been working around the engine and wondered if I had knocked a wire loose, but can't find one.
Is this something common or well-known, and easily user-serviceable?
I note that one can buy a replacement oil-pressure sensor, but don't know where it is on the engine itself, to even inspect it.