If you are unable to mount the IIC unit in the designated area, we recommend choosing an area that has relatively good air flow and away from high heat. The orientation of the board is critical, you must mount the control unit flat / level with the plugs facing the passenger side. The arrow must be pointing forward and the box must be close to level in the other directions. Calibration will compensate for some tilt as long as the arrow is forward. You must also tell the system how far left or right from center, and forward or rearward of the front axle it is mounted.