If the gauge is "thermal" (uses a little heater and a bi-metal strip to move the needle) it will NOT be polarity-sensitive.
If it uses a "magnetic movement" (electromagnets move the pointer) MOST LIKELY it WILL be polarity-sensitive.
There's no explosion in the tank 'cause the voltage/current/thermal mass involved in operating the fuel gauge prevent enough heating to light off gas fumes.
That being said, I have seen MANY fuel gauge senders and in-tank fuel pumps overheated with charred/burned wires 'cause of a short feeding too much current into a fuel sender or a fuel pump that failed and shorted out.
There's no explosion because the gas/air mixture in the tank is too rich (outside of the narrow range where combustion can occur).
From an engineering handbook...
Gasoline "Lower Explosive or Flammable Limit" (LEL/LFL) 1.4%
Gasoline "Upper Explosive or Flammable Limit" (UEL/UFL) 7.6%
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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