[dmjlambert]

Unscrew it from the back of the cluster. I use a small wrench from my ignition wrench set. The most proper tool is probably a small flare nut wrench. It will probably drip a very small amount of oil. If you start the engine with it disconnected it will stream oil out of it. I have moved my truck over a couple of parking spaces with the cluster disconnected, and I catch the oil in a pan when I do that.