Replacing Switches with Potentiometer
You can not plug directly the wheel potentiometer to the chip. You have to add a microcontroller that will emit a pulse every X rotation to the chip. 

If you don't want to use a µC, you can use an encoder : the encoder will generate a pulse every X rotation on one pin. I think will fit your need. 

http://www.ebay.com/itm/3Pcs-6mm-D-Shaft-18-Position-360-Degree-Rotary-Encoder-w-Push-Button-LW-/171816111876