I heard that I can clean up minor corrosion from underneath the dash by soaking the guage terminals, and distribution blocks with WD-40 and letting it sit for a couple of days. Has anyone tried this or know of a better way?

i would use electric contact cleaner. followed by dielectric grease on the contacts. or daping liquid plastic on the contacts

'pends on what type of corrosion...

Green crap on brass? Start with a penetrant (WD40, CRC, etc) and disassemble.

Then take a wire brush and clean each disassembled component individually.

When reassembling, dab waterproof grease on the terminals, assemble them, then spray them with a protective covering (cosmolene, battery terminal protectant, liquid vinyl).

Yes - just light green crap on terminals. Is taking the terminals apart necessary? The boat will only be run in fresh water for now on.

I have the same problem with one of my boats. I'm just going to replace the whole fuse panel. Anyone know where to buy them? I think there were 18 fuses in the panel.