This comes up regularly, the best way to get your tag & insurance is to just say what your vehicle is, I learned this the hard way about 30 years ago. It really doesn't matter whether it runs on gas, electric or horse crap, don't confuse the beaurocrats. Instead of being real proud of what you did on your Frankenfurter, Gonculator or Blivetmobile, just say you need a tag/insurance for your boring Geo Metro.
Also it's generally not worth getting more than liability on a conversion and most won't offer it on an unknown converted vehicle contents. I figure if it gets crunched, I'll strip it and get another carcass. I have Erie and also helps to have your house, motorcycle etc with one company, they are less fussy then.
Have a renewable energy day,
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