bj25 instrument panel operation

[EllianCM]

How does this instrument panel work? It was imported to Brazil until 1967, then it was nationalized, I want to know how the temperature and fuel, ohmic range and power supply work

 

[45Dougal]

How does this instrument panel work? It was imported to Brazil until 1967, then it was nationalized, I want to know how the temperature and fuel, ohmic range and power supply work
View attachment 3445211

I guess these are the earlier type that used a bimetallic regulator in the sender - its not just a variable resistor. Search around here for bimetallic sender info.