( ) In order to engage the Auto Pilot you need the vehicle to be on and running. After this you can do it in two differant ways. You can turn the large knob to a selected number in the little window which means a speed ( ie 3=30 or 5=50 or whatever ) and then pull out the end knob. Press on the foot feed until you fell the unit "catch". The car will gain speed up to the number/speed you selected. There is a caution to be known at this point. If you do not have clearance in front of you, you will gain speed to the rear of what ever is in front of you. If you touch the brake pedal at any point the unit will dis-engage. The second way is the same as the first but this time just do this to match the numbers with your speed as you are driving. You will feel the foot pedal move as they are matched. If you would like to increase the vehicle speed just turn the large knob from say 6 to 9. The same in reverse if you do not want 7 and would prefer 3. If while engaged the vehicle in front of you slows to a lower number than what you was cruzin at just slow as you would with the brake and then press on the foot pedal until you feel it re-engage. A historical side note to this unit is that it was designed by a man who was blind. Rodger & Gabby Colo Spgs '47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler '63 Le Baron w/F-Sweep trunk lid & std A/C '66 Le Baron w/dual A/C & reverbed AM/FM '70 Overlander - InterNational