I just ordered a Raymarine ST 1000 for my boat. I just want to hold heading mainly because I fish alone. I hope it will be strong enough to drive my big motor, connected by a rod to my kicker motor. I have found that I must drive both motors to have enough rudder surface to control the boat in choppy waters. It dos require quite a bit of torque to move both motors. Hope it works.  I know it is made to drive tiller on a sailboat which would not require much torque, although it says it can 125 lbs