If you go back further Bob vehicles had moving iron fuel gauges with two coils. These relied on max resistance when full and had no need for voltage regulator. Easy to identify because you got an instant needle reading when ignition switched on. Both types were used on Series Land Rovers with the change to bi-metallic in mid 1967, to add some chronology.
As you can imagine there are numerous LR forum posts with owners querying why their gauges are working backwards
