Jeep used the same design (fuel gauge ivr) I have been tempted to buy a jeep gauge because they "look" close, if not spot on, in our design in form, fit and function.
The Jeep gauge is also repoped and pretty cheap in comparison and also retain the gauge internal IVR. It has been a couple years but also think the internals are updated with a lot more adjustment.
I have found when the gauge is outside of that +/- 20 ohm it becomes non functional. Another factor to consider about gauge calibration is the extent of the bi-metal deterioration. The supplied voltage and insulated resistance wire heats up the bi-metal and that is what actually makes the gauge needle move.