Well, seems I´m on my own with this: I asked Autometer about the problem, and they asked me to check the product number. Checking it, I realized that I have the incorrect gage: 240E-33F ohms which matches with the universal fuel sender that came with my 1300 Street Rod Artic White Kit.
Now I see clearly why the gage works backwards: In this product, the more resistance, the more the pointer goes towards E, so, when the GM sender floater (0-90 ohms) rises and increases resistance, this gage reads towards E.
I have two options: Adapt the universal sender to my fuel tank, or replace the gage with the correct one.
Thanks anyway to all those who read the thread, which I hope becomes useful!
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