[CA] What system will work with a Raymarine st6000 Pilot?

[reggie]

Problem 1: will a Raymarine s100 work with my Raymarine 6000 Remote control system?
I have Raymarine 6000 automatic Pilot control, & a Raymarine 6000 Remote control module. I just dropped my remote into the sea accidentally and picked up a Raymarine lower cost S100 Remote control only to see if it would work on my system. But so far I cannot make it see my system.
What systm can I purchase to upgrade my 6000 automatic pilot rudder control?
I have a Raymarine 6000 automatic Pilot control, & a Raymarine 6000 Remote control module. On a two Volvo 225. Which I like very much as it integrates with rest of my Raymarine products. However I would like to get rid of the hard cable that goes out to the stern on a cable system for rudder indicator. I have broken over 4 cables in the past 4 years. Plus one time because the cable is attached to the hydraulic lines it ripped one of them off and I lost all steering. It is a very bad design and the cables are impossible to change out with our modifying the cable.
So is there any Raymarine product I can add to my system to get rid of the cable rudder system, some thing electronic with scraping my whole system?
Would the ACU-100 work?
See the attached image of what I have now to the rudder indicator.
a. Raymarine C-120 Color Radar,Gps/Plotter.
b. EVC Display system
c. ACR Rapid Fix 406 MHz EPIRB w/ GPS Interface
d. Raymarine Electronics 120 Display