The voltage sensor is on the same PCB as the current sensor.
If you are not measuring current because it might be TOO massive for the sensor, you just need a small/short positive wire to the battery connector to measure voltage - current doesnt need to pass through the sensor. Ground, or 0volts still needs a good connection to the BEC or sensor Hub for the reference and powering the sensor board.
If you are measuring current but it MIGHT go a bit over the sensors range, then that is still OK - the actual Hall sensor device handles higher current (in short bursts) than what it can measure and report.
If that is the case, wire it all up as per the Mauch diagrams.
To measure the battery voltage without using a Muach PL sensor, you can just make your own voltage divider and connect to the Senor input on the Hub (where you have the red cross) to GND and U pins.
Select suitable resistor values for your battery voltage. The maximum input voltage is 3.3volts.
thank you very much Mr. Shawn for the multiple solutions to my problem.
i have ordered the the PL 200A sensor. and will install it soon.
I’m using a hobbywing x9 combo motor (hexacopter ) i think it could handle the current . since projected average consumption would be around 140-150 amps. ( total weight 60kg)