If a person is installing a 280mm sender AND AT THE SAME TIME putting in a real gauge with a sweep dial that had a 90-0 ohm rating as opposed to a 0-90 ohm rating couldn’t you just swap the sending unit wires so the gauge worked properly and not in reverse?
No, resistance gauges are not polarity sensitive and swapping the wires will not change the resistance over the measured range. The sender is constructed to produce a given resistance at empty (say 0 ohms) and a given value at full (say 90 ohms), with of course the range in between. Changes to the external wiring will have no impact on that . If you were to install a 90 (full) to 0 (empty) type gauge with a 0 (full) to 90 (empty) sender then it would work, but would read 'backwards', i.e Full when empty and Empty when full. Gauges and senders always need to compatible (or made compatible with a signal conditioner-Google Fuel Sender Signal Converter).
