Replacing NECO auto pilot

[I Wanda]

I Wanda is a Camper Nicholson 40 build in 1979. After 37 yrs of service, our NECO auto pilot has reached the end! Our boat is stirred by a Wagner hydraulic system, which includes a type N series 700 RAM and 3 pumps (1 for inside steering, 1 for outside helm, and the third one for the auto pilot. The NECO was connected by a small chain to the hydraulic pump. I would like to keep the same kind of set up and am looking for a power unit who, like the old NECO, would use a chain to activate the hydraulic pump. So far, all the products I have seen have a power unit with integrated hydraulic fittings. Any suggestions will be welcome. Thanks, christian Verlaque, S/V I Wanda: