My take on the rudder angle readout which we have is that to me it is fairly useless. Every time I feel the need to check it, I automatically look at the position of the wheel
which has a mark at top dead center and is visible anywhere in the cockpit
especially including fwd of the instruments where the sail control lines are located. Although not as precise as a digital readout, for my purpose, it gives me an instantaneous idea regardless of where I am.
Why not fill the fourth hole with a repeater display from which you can select any number of readings?