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Thank you for your inquiry.
In this case, we can recommend to use FM6300 and RS232 / RS485 solution to get Fuel level data. For example, the sensors can be: DUT-E (Link: https://www.jv-technoton.com/products/dut-e/), UL202 Fuel Level Sensor (Link: https://wiki.teltonika-gps.com/view/UL202_Ultrasonic_Fuel_Sensor#FM63XY.2FFMB630_configuration)
Please let us know if you will need detailed information about this solution or something will be unclear.