You need to bring up the configuration menu in the Teco and change the source of the RPM adjust from the up/down buttons to the potentiometer on the keypad. On my Teco 7300 you set menu 1-06 to 0001 instead of the default setting of 0000. Go to the Teco web site and download the complete PDF manual then go through all the menu items to see how your unit is set. Forget the little manual that comes with the unit its not worth much. Most of the default settings will work buy you will want to play with some of them. Its takes reading parts of the manual several times but eventualy you will get the hang of the settings.