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FMB920 does not support CAN adapters.
For fuel sensors You can use either bluetooth or analog sensor.
Please see here for calibrations of analog liquid level sensor: https://wiki.teltonika-gps.com/view/FMB920_Status_info#LLS_Calibration
Also You can use OBDII dongle with FMB920 to get additional parameters via OBD interface.
More information regarding this here: https://wiki.teltonika-gps.com/view/How_to_connect_OBD_II_Bluetooth_Dongle_to_FMB_device#Supported_Bluetooth_OBD_II_dongles
You can use either Analog sensors, which do not require bluetooth, but requires analog interface.
As for bluetooth please see this:
But it does require 03.27.01 Rev:00 or later version, for this YOu have to contact Your sales manager and explain Your situation.