That's the original trim sender. Probably the PO changed it to a newer style trim system which uses a self-contained pump and actuator (actually the pump just reverses rotation).
You should be able to add power steering, which would involve adding an actuator, power steering pump, power steering cooler, lines and belt (the crank pulley is usually already there.
Before going that (fairly expensive) route
, you might want to check the condition of the steering cable (kinks, tight bends or abrasion that has allowed corrosion
to form inside) or the helm
itself for corrosion
or lack of lubrication.