Thanks George,
I used some clip leads to add a 40 Ohm resistor to the circuit, and the gauge needle moved a bit toward 'empty' on the dial....as expected. So that's good news.
At some point in the near future, I may drain all of last years fuel from the tank. If so, I'll incrementally add new fuel back into the fuel tank and take note of the fuel gauge as I refill...just out of curiosity.
Mike