DI-1110 counter function with flow meter K factor

DI-1110 counter function with flow meter K factor

using DI-1110. 
I want to use a flow meter with a pulse output. 
Can I program unit  to give me a output in gpm?
I have a K factor for the meter, which gives me counts per gallon.
Is there a way to do the math and display "GPM" units on graph??
thanks