there are 2 thermometers going. The one that is built in to the top of the weber lid (well, it didn't come with one, I put it there.) and a probe thermometer I have at grate level.
The charcoal is arranged in the 'snake method' on the opposite side of the meat for indirect cooking. (thought the snake is pretty much gone now and I've already added a few coals and another lump of mesquite.