You can get a cadence monitor, but you can easily get by without one. If you have a metronome, set one to 160bpm (I find its more useful to double the cadence and think of each foot making a stroke down with each click). If you dont have one, try this. http://www.metronomeonline.com/ Play it long enough to get a feel for the tempo and go ride. I dont think hitting an exact cadence value is that critical. The metronome technique will get you in the ballpark.