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I would put a couple of pipes on the head like the other guy stated. That way you gauge the depth of the hole and not the 3 point. Depending on tractor angle and all, using the 3 point gauge would be less than accurate. If it was something I was going to use for a long time, it would be adjustable were I slide a pipe into another pipe and use like a 1/2" bolt to tighten down on the side. This way it would be easily slide in or out for an adjustable stop. The plate idea sounded good at first, but think about it, it's going to sit down on top of all the dirt and will not actually ever hit the level portion of the ground. Now maybe a plate welded to the end of the pipe with a large hole in it, where it sits on the ground first, and the pipe slides inside another pipe until it hits a gauge pin (bolt). This would work but when you pick up the digger there will be a lot of dirt on the plate. I can see where possibly the plate, if heavy enough will keep the auger straight and fairly level. Might work. Even though the auger doesn't move up and down in a straight line, more of an arc, I think for 16" of travel it's fairly straight.
The only other thing I could think of is welding something the the flights on the auger so it will quite digging at 16" (Slow way down anyways).
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