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You are talking about severa different problems. One at a time -
You state estimated range is grayed out. Grayed out data parameters means that the data is not available or another parameter required to calculate the parameter is unavailable. Do you have a GPS connected in your system? Without vessel speed, the range remaining can't be calculated and that parameter should be grayed out.
Your description of the "cigarette lighter" sized device sounds like a Navico fluid level sender assembly to me. Assuming that is what it is, I would want to know what instance the converter is set to. Does the instrument show a valid fuel level? Which of the possible positions on the display contain the fluid level bar? That can identify the assigned instance.
I'd also ask how you have verified that the tank calibration has actually worked? Perhaps it is still the default calibration? The instrument fuel setup functions use NMEA 2000 messaging to perform the various functions. If level calibrations are actually working, there should be no reason for capacity to fail.
Thanks for the additional info. That helps! So if you have valid speed data, then the range calculation requires valid fuel flow data and valid level percentage and tank capacity data. I'm going to guess capacity is the problematic parameter since you seem unable to configure it.
Can you tell me what instance the fuel tank is configured to? The 4.3" instrument is caable of displaying up to 4 fuel tanks on the fuel screen. The bar indicating level for your tank should be in the leftmost position on the screen. This would represent instance 4 fluid level. Would you please confirm that is where it is appearing?