There's any number of cheap analog ammeters out there Tom. I bought one last winter and put it on the hot line after the gen/shore power switch. I have it for the opposite reason - my gennie will make more power than I can use but we routinely overload the shoreline. Mine's about as handy a location as hip pockets in long underwear but it was quick and easy to install and it didn't cost anywhere near $250 - $40 if memory serves and that was in a chandlery so I could likely have done better.
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