What is that wire? Oil pressure indicator light

[Jubbie]

So on my 74' Targa I was fixing my oil pressure indicator light and I noticed that their were two green white wires that were connected to the light along with the one red black hot wire. I could not find the second one in the diagrams. I assume one of the green white wires is from the engine compartment. I was just curious what the other green white wire was.

Does anyone know what the second green white wire goes to? I figure it will be useful information someday.

Yesterday I had a good electrical day. The oil pressure indicator light did not work, the horn did not work and the left brake light did not work. I found that the oil pressure light socket was loose, the horn relay pins and contacts were compressed and dirty, and the brake light socket was oversized. With a little of this and a little of that I got all of them working after an evining in the garage. All and all a great night killing gremlins.