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Funny. that reminds me of the big red "Eruption" button at the Mt. St. Helens Visitor Center. Probably most pressed button in Washington State. I'm actually reasonably sure this is an OEM button as my friend in the slip next to me who has an OA42 sedan one year later has the very same mystery...

Thanks all. Definitely wired somewhere on the backside. Looks like I'll be digging through the spaghetti with my multimeter unless someone sees this who might know offhand.

Anyone with an OA 42 sedan of late 80s vintage know what the little unmarked black buttons on the helm gauge panel do? I'm redesigning my helm panel to accommodate a chartplotter and trying to figure out what to label these (or even if they're useful to keep). Buddy at the marina who has the...