The only thing the tie rods control on a drag link solid axle steering is the toe-in. The drag link is not adjustable, so the only only way to center the steering wheel on this setup is to remove the steering wheel and place it as close to center as possible on the splines with the pitman arm centered. The steering wheel only steers the driver's side front wheel and the tie rod just allows the othe wheel to follow. Usually people refuse to believe this, but it is true.