Hi Mr. Vlad and the community.
The fuel tank levels for the B1900 failed, it does not let me see the fuel of tanks 3.4 as aux, there will be some way to assign tanks 1,2 as main the custom configurator does not allow it.
In the B200 to B1900 (Carenado) series aircraft have 4 tanks, two main and two Auxiliary, numbered as follows 1 and 2 main, and 3_4 Auxiliary. TI the dataref that controls it is ..cockpit2/fuel/fuel_quantity [0,1,2,3], as we see in the image they are Indicated fuel level per tank, in kgs.
I propose create in configurator Show Aux-3_4 on a Fuel Gauge (hold button, spring-loaded switch)
Fuel Level Indicated, 1 Fuel_Level_1
Fuel Level Indicated, 2 Fuel_Level_2
Fuel Level Aux3 Fuel_Quantity_Aux (default B1900) Fuel_Aux_3
Fuel Level Aux4 Fuel_Quantity_Aux (default B1900) Fuel_Aux_4
I do not think it convenient to have 4 independent indicators Fuel_Level_1, Fuel_Level_2, Fuel_Aux_3,Fuel_Aux_4, since this aircraft only has 2 needles for its total fuel indication, with only two needle (ng) it would be necessary.
and select with a single (hold button, spring-loaded switch) which would show the two states of the levels, please do not use the Fuel Level 1 + Fuel_Aux_3 = total Sum Left side Quantity or Fuel Level Left indicator. like in the C90 plane.