If that is all you have, I would trash it. The important bits are the windvane
and all the adjusting mechanisms involved. That system uses a windvane to move to trimtab which in turn moves the auxiliary rudder
. It would not have much power and so the boat would need to be really well balanced on whatever point of sailing you're on, which of course one should be trying to achieve anyway, but is often quite difficult when beating or in stronger breezes and a seaway pushing the boat about. Google
"Windvanes" and there are any number of designs, my preference being for pendulum types like Aries
. Then check eBay, I bought a good Monitor
there quite reasonably and I took me across the Atlantic.