Chuck, with holiday activities beginning to shift into high gear, it may take me a couple of days to get the mailing info for you. In the meantime, here (below) is a pic of the blade. It's a little caked with pitch (I'll take care of that) and could probably use a sharpening at some point. But the last time I used it, it was still cutting well. I inherited this blade along with several others and an older contractor style Craftsman tablesaw (model 113.299040). It's previous owner was a contractor and his daughter (a friend of my ex's) gifted it to me, for use on the house I was remodeling at the time.
These types of dado blades are effective but just a little troublesome to use--you can't completely trust the markings for getting accurate widths. Insead, you just set it to some value close to what you'd like to achieve and then run a test pass or two, making adjustments after each pass.
I don't know of any instructions, but the principle of operation is pretty straightforward--there's a small (maybe 3/32") Allen head set screw that you loosen and then simply twist the dial on the wedge to change the amount of wobble, which affects the width of the cut. Once you get it positioned, tighten the set screw, mount it to your saw (it fits a standard 5/8" arbor), and away you go. Don't forget to use a wide enough throat plate--if your tablesaw didn't come with a dado plate, then you can always buy or make one.