I have seen the 1980 before but I was at lothe local dealer today and spotted something I had not noticed earlier. They route the Speedo and transducer wire directly into the bilge via a through-Hull fitting. For those of us who have struggled to pull wires through wiring tubes, this is huge. It also goes a long way toward reducing noise on the transducer circuit by keeping it away from the engine charging circuit.
Another good detail.