I actually purchased the same water meter a while back. These types of water meters have reed switch inside and it doesn’t output an analog signal directly. Instead, you need to use a digital pin (ideally interrupt pin) to count the number of clicks within a unit amount of time, and that’s proportional to the flow rate. We are working on adding support for this type of water meters in the next firmware. The current plan is to make use of the rain sensor port, so you can connect a water meter to the rain sensor port, and the software will allow you to choose between using that port as a rain sensor or flow sensor.