Oil Pressure Switch? Extra wires

[demian5]

So I have the engine and trans out and want to clean up the engine compartment. I have some extra wires i would like to clean up.
The truck had two temp senders, one in each head (both green wires), I don't know why. Both were hooked up.
There is a larger wire with a rubber spade plug type connector.
There is a 2-prong connector with 3 wires going to it.

And should my truck have a generator and oil pressure idiot light along with the gauges? If yes, where would the oil pressure switch be installed? I have the gauges.

I did some searching but didn't find anything, and none of the wiring diagrams had anything.

Could this be an AC harness?

Thanks.