The Evolution autopilot, from a DIY standpoint is without a doubt the easiest system to install. Virtually everything is plug and play, and in the case of this kit (part # T-70157 ) everything exclusive of the plumbing is included in the box.
The nomenclature for some of these pieces are new to Raymarine. The white and black EV1 is the sensor core. This is the computer, and heading sensor. The gray box which looks a lot like Raymarine's older course computers is the ACU-200 (Actuator Control Unit). This manages the steering actuators, and the version depends on the type of steering system your using.
The rest of these components are more familiar. The kit has a rudder reference which in my case isn't going to be used because this boat has triple 350HP Yamaha outboard engines.