There's a propane kit somewhere that's more of a shopping list than anything, but you can use all those parts with some modifications to run NG as well. The hardest part to source is likely to be the large capacity high pressure tank.
That you live in NY may change things slightly. I'm sure the installation will need to be inspected for both safety and emissions as well as the title being updated to reflect the changes, and that's if they'll "allow" the conversion without going through a custom vehicle inspection.
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