voltmeter and oil pressure install

Ok So my car came with a oil pressure and volt meter a-pillar gauges very nice, thing is none of them are hooked up, and there is no sender unit for the electric oil pressure gauge.

My questions is where is a 12V source under the hood for the voltmeter since the wire is already just dangling around inside of the bay( I have it taped up and secured) and I would like to avoid rewireing it back into the cabin if I don't have to?

Also is there anyway to hook the oil pressure sensor up without the sender unit, maybe possibly through the idiot light sensor that comes stock? I doubt it but I thought I might ask.

As far as the voltmeter goes, open up the bottom of the fuse box, there are plenty of sources there. Just make sure it's ig on.
The oil press g reads a certain voltage from the sender, unless you use a source that sends the same voltage, you will get a wrong reading. Also, if I'm not mistaken, the stock press sender is the on/off type, and won't work with a gauge.

thanx for the answer, Thats what I thought about the Oil pressure but I thought I might as well ask.