Frequency Counter Library

Hi, I'm trying to use Arduino Uno with 2 flow sensors.
They pulse at 3300 per litre. I have them hooked up to pins 4 and 5 on my arduino.
My question is can I use FreqCounter to read each one separately and over a 1 second period?
I have looked through the code and I can't see anywhere to allocate the pins I want it to read..

I've had a quite look through the C++ coding. If I change every occurance of T1 with the relevant T number for pin4 or 6?
If anyone knows where i can find those T numbers that would be awesome :slight_smile: