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Cuav X7pro fuel level sensor monitor

I’m currently using Cuav x7pro on my octocopter which is powerd by richen power EFI engine .planning to integrate fuel level sensor on it and opoinon from vendor as same.

Which pin I have to connect for Batt_current pin to know the fuel level remaing to be.
In mission planner I have not seen BATT current pin for CUAV as all other hardware manufacture listed like HEX and holybro .

Servers by jDrones