There's an old manual for a 3000 wheel pilot here:
Raymarine Marine Electronics - Retired Autohelm Autopilot Manuals
Might be closer to what you have than the 4000... can't find a WP2000 listed
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)