HI @kevinlee38086
Here's the manual that may help.
See p.5 for the location of the flow meter. Presumably the flowmeter sensor attaches to it somehow
Usually flowmeters are a turbine located inline with the incoming (or outgoing) water supply and it rotates when the water flows through it. One of the blades of the turbine has a magnet attached to it. When it passes the sensor the magnet operates a reed switch in the sensor, which sends a pulse to the control board. Basically the control board counts the number of pulses it receives so it knows how much water has passed through the flowmeter i.e. no flow, no pulse
Did you get the sensor in a package with the sensor's part number on it?
If so the manual has a parts diagram with a parts list which shows the location of the parts as well as its part number. You may be able to locate the sensor location that way.
It also shows the connections on the control board as well
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
1