Finster,
I'm no marine electrician but have a '78 I/O Sceptre 23 (7.4L Bravo One) with a lot of metal in the water (beside the outdrive, have Kiekhafer tabs, transducers, etc.). I mounted a large transom-mounted zinc plate and have all underwater hardware bonded together with #6 wire and to the zinc plate itself. I also have a Guest Dynaplate (sintered bronze ground plate) that was used as a ground for my old Furuno loran, but the ground plate itself is not going to help reduce your electrolysis; if anything, it would probably help make it worse with more noble metal underwater.
I also keep up with my outdrive and tab mounted zincs carefully and so far have had no real problems with a now 20+ year old outdrive and my tabs still look like new (I am sure I just jinxed myself by typing this). Sorry I cannot upload any pictures just now.
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