To activate the high idle, turn your switch into the ON position and switch the cruise to the ON position. This should result in an idle of 800RPM. Press the SET button on the cruise and the RPM should climb to 1200. Slide the switch to RESUME and the RPM should be at 1800.
Note if the brake pedal is depresses, or you put the gear selector anywhere but PARK or Neutral or you turn the cruise control switch to OFF the engine will return to normal idle.
Click Here for Install Instructions
Please see the installation instructions located here.