Here is a good link
http://www.madelectrical.com/electri...elcoremy.shtml that gives examples of what to order at the local parts store. Go down a ways and look under application data. If you don't find the "clocking" that you like, don't worry about it. Just remove the 4 bolts and turn the back to where you like it.
As an electrical engineer, I recommend going the three wire route. If you already have an idiot light on the dash, it should be easy to wire that way. Getting the sense wire as close to the battery as possible will give you the best charge voltage. With the head lights on and other accessories it can make a couple of tenths of a volt difference in charge voltage. If you don't drive at night, don't have AC, a big stereo, or other electrical accessories, then the one wire will be OK. The other way to make the one wire OK is to use a fat and preferably short wire. Say #10 or larger. The factory did not run three wires because that extra wire that they needed to use up. They did it because that was the most cost effective to get the performance they wanted.