Stuck inside on a snowy day so I thought I’d upload a couple of pics. This is the original 12v panel the boat came with. The little bar over on the right is the original negative bus, a hunk of bronze. The plastic blog is the terminal block. Set screws hold the wires in. They’re all badly corroded.
The new panel is obviously more robust with charge monitoring, AC panel, USB and lighter-plug sockets, and more granular control over circuits. I’m not sure what state of the art for Swedish boats was 39 years ago but I feel like the new incarnation is pretty good.