I noticed when I was looking at the units currently available that the listing didn't show this picture. The unit didn't come with instructions other than to say the unit needs to be tilted back slightly to allow the condensation to drain.
The picture somewhat shows the wiring, pretty straight forward, a ground, a red wire with in line fuse that goes to 12V switched and a green wire that needs to run to the compressor clutch. The switches are pre-wired.
Hope this helps.
Z AC W by
M Patterson, on Flickr