I've been running the little cheapie for three years. It lived under the hood of my last diesel, and saw all manner of conditions, with no troubles. Just put it in the back of my "new" rig, since the larger diesel I have now doesn't offer the room under the hood. Like others here, I had to do some wire-replacement, but for the cost, this thing works awesome!!
I put the adapter on it as well, so it can use a standard quick connect. Also have a two way manifold and some y's rigged up with a few hoses, and a bleed valve, so I can air up or down all four tires at the same time. Very handy.