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You'll need to buy the encoders + a mounting kit, or construct your own way of getting the encoders fitted on your dob. I can show you mine on May 7, westsky made them himself.. but it really depends on whether you have access to the tools required.
You could try buying a second hand SkyCommander, or a palm like the others have said. The argonavis is clearly the best of the bunch, but at $600 for the computer it may be out of your budget.
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