Navigational upgrades

[sailorgary10m]

Hello forum,

I recently purchased a sailboat, which was equipped with a RL 70 radar display and an RC 520 chart plotter. As well as an autohelm ST 4000 autopilot with micro logic ML 95 remote.

Unfortunately both the radar display and the chart plotter are LCD and both are too dark to read. The radar display is located in the cockpit and the chart plotter in the cabin. It's my understanding that I can replace the RL 70 with an RL 70c display without having to reconfigure any of the wiring (plug-and-play).

My question is can the RC 520 be as easily replaced with an RC 530 color chart plotter or the SL 530 color chart plotter without having to reconfigure any of the wiring, and still have full usage of the autopilot, and other autohelm instruments.

Any help would be greatly appreciated.