The flow meter is the 1/2 plastic flow meter Liquid Flow Meter - Plastic 1/2 NPS Threaded : ID 828 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits from Adafruit.
It does use pulses, and I am able to get it to show input in the serial monitor, but I don't know how to take that data read, and use it in a sketch on the LED side.