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Sounds like an old Sampson Mount. Twenty years ago they were considered top but even the cheapest of the modern mounts will perform better. I think trying to computerise it will be a very frustrating exersize, even if you have access to machinery and are adept with electronics.
The "anolog" control device will need extensive design work to make it work with the output of an auto guider. Do you have a worm and worm wheel drive on both axes. If so can you fit stepper motors to the drives. If so you could use a control system like the Bartell's system.
Twenty years ago I tried to build a mount like that but fitting drives was such a problem even when I have all the necesary machines and tools was so frustrating. I had designed and built a "goto" stepper motor drive system that worked but never got it fitted to the mount. I eventually gave it up and bought a LX200.
Barry
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