I have to agree with those that say forget wheel
ONLY way to go is below decks hydraulic...and one size larger than the maker recommends.
I have an ST5000 without a rate gyro and it has worked fine for 10 years.
Only problem it has...not really a problem and could be improved with a rate gyro ... is downwind in heavy sea...even with the seastate control on max, it has difficulty keeping the boat straight. However, all pilots have this problem to a degree as they cannot anticipate, only react to changes...and if they don't act fast enough it could be too late.
I also have a Fleming windvane
which I use most of the time when sailing as it uses no power, and when the boat is balanced, it performs faultlessly.