Neebie Question

I was just wondering how to install a oil pressure gauge. What do I tap into, I would be using an electronic autometer gauges. Also, what about a voltmeter gauge, I figured this would just be connected to the batter, but that's just a guess. And lastly I'd like to add a water temp gauge too. I'm not extremely mechanically inclined. I know I can do everything for the interior and running all the wires, I am just not sure what to run them to.

Thanks,
Nick