Oil Pressure Safety Switch questions???

[southcoasting]

OK,
So, have been browsing trying to learn more on things I see on my engine while going through it and looking at it...

I have not started it yet as I bought my boat in August and its been winterized since...

One thing I was looking at is around the oil pressure switch, there is a lot of oil accumulation...I think it's leaking so was thinking of just replacing it and getting the Moyer marine version that sits upright. The one I have is pretty old...

So looking at the one I have, it is located to the right of the fuel pump. So te one currently on there has 3 wires going to it...Well, the positive & negative and then a third connection that is like a line going somewhere...Was not able to track it tonight at it is in an awkward location and hard to get to...

If I get this replacement switch, what do I do with this extra line? It seems the new switch only uses a +/- electrical connection and that's it...

Also, I took a pic of this as I first thought it was the Oil pressure safety switch. If this is not it, what is it? Why does it have only one connection?



I had also noticed there was this black wire running from my cockpit oil pressure gauge to no where...Should this wire go to that other connection on the other switch pictured above? Where should this wire go to (Pictured below)?