To answer the question here if anyone comes across this in the future:
The variable resistor lets you know the range of resistance between the two.
WHAT TO BUY: if this a problem for anyone, there is a device called the “Dolphin” and another called “MeterMatch,” both of which can be bought on eBay for 30 and 60 dollars respectively. They both operate as a mediator between the gauge and sender for your fuel system. Essentially, the device will regulate the resistance between the two automatically.
I bought the Dolphin. It took 15 minutes to set up, and it came with decent instructions. Completely solved my issue, and now my gauge properly reads the level of fuel I have. So far, 10/10 purchase
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This reply was modified 1 week, 6 days ago by
Stefan.