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jtrantow - Good to hear from someone with the same hardware to convert. I think what I will try first is a slotted disk with as many slots as I can reasonably fit on it with one deeper slot and 2 optical slot detectors. It may wind up less slots than you have and since I would only have one detector reading them, I will have less counts per rev but will see how it goes. I like the idea of the slot detectors because they don't have any moving mechanical parts like a rotary encoder. It should also be less involved to implement than a rotary with the sprockets, belts, brackets etc. Maybe I'll wind up with a rotary but I'm going to give this a try.

Thanks Again.

Thanks for the reply PCW. I guess I will go with a system that has an index and also at least some number of pulses per rev on an additional channel.