Thanks you all for your times and attention, it's was a Suzuki , Ertiga 2017 model. As I already posted, this car take the fuel sender unit status using a pulse with 10 Hz which comes from Body Control Unit. I haven't enough knowledge to manipulate the BCM to get the fuel status and so , I tried to convert this pulse signals to analog voltage and then , calibrate fuel amount with converted analog voltage. I've to admit that I have tested it wrongly and one of my colleagues messed some wiring and the result was built-in fuel gauge gone!