The digest mode is making this hard to follow, but if it is what I think it is, modern wheel drives currently sold by Raymarine and all the old versions of AH3000 and AH4000 drives all will work just fine with modern or old control units. It is just a DC motor in there with two wires that can turn one way or the other way. I keep fixing my 28 year old AH400 and it keeps steering the boat. It does great under power or beam reach to close hauled. Downwind with any waves over about 2 feet it is all over the place. Joe Coquina C&C 35 MK I
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