New Meter on order

Hi Guys - I've had my meter for some time, but because the hall sensor and sending unit need to be weather protected I've not gotten around to installing it yet, but will be attempting today. I just wanted to confirm that I am understanding correctly that the display unit must be powered by 5 volts USB, requiring a 12 volt to 5 volt converter? Also, the sender itself needs to have BOTH voltage testing connection to the battery, AND separate power connection to the battery bank for self power? My meter came with a VERY poor copy of the Chinglesh instructions.

Thanks very much for any help!