I have recently purchased a yacht built in 1984 and am bringing it back into cruising condition. I have an old tillerpilot with the compny name NAUTECH on the compass dial. I would dearly love to find out as much as possible about it. It works fine in the "rough" and in the "calm" selections. It has a section that appears to be a L.E.D. panel but it is dark. It also has what appears to be a jackplug inlet for the vane input perhaps? What sort of maintenance do these devices require? Does the company still exist? Were there any circuit diagrams or user manuals? Would love to get any and all info please.