Fuel Sending Units and A-Body Fuel Tank Map

RedFish said
What you have pictured there is quite different from the domestic Dart instrument panel. That instrument panel is Philco/Ford design. Where our Chrysler panels have copper trace on phenolic circuit boards, our Fords have that same copper trace on plastic film you have there.
The "unit connected" you show attached with 2 button/snaps is the PhilcoFord version of instrument voltage regulator. It does the same thing as Chryslers instrument voltage regulator, reduces 12 volts to approx. 6 volts so their same gauges originally designed for 6 volt systems continued to work in the later 12 volt models.

Ok, thanks a lot! If that is a voltage regulator/reducer, I need to make adjustments with the reader unit assembled in the cluster.

This is a 4 door Dart assembled in Brazil in 1976. It is all stock from factory and mostly identical to the 69's made in the USA, with some differences like brake system (Varga disk on front and drums on rear), rim wheel bolt pattern is like fords 5x4.25" on 14"x5.5" rim wheels, etc.
I guess Chrysler pulled old parts from discontinued models in the USA and assembled them in other countries which would buy them as current models, with some improvements.

I've been playing with the fuel reader unit trying to adjust it but no luck. I have 2 OEM readers and they both have different readings... when connected directly to the sending unit both read full tank when it should read 1/4 tank and when they should read empty they show like 1/2 tank or so. Then I had another look at the cluster and found that unit was connected to the gauges.

Thanks a lot for the info!