My experience was very much like Yar's. I've converted one vehicle from 6v to 12v and didn't put a resistor on the fuel gauge. I never thought about needing to do that. I put over 100K on the truck after the conversion & never had an issue with the fuel gauge.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.