Replacing a magneto coil with an odometry sensor - SharpX X1S, X2S, XSU

AutoVu™ Navigator box Technote

SharpX X1S, X2S, XSU

If an existing Navigator box installation includes a magneto coil that is defective, you can replace the device with an odometry sensor.

What you should know

  • The magneto kit is no longer available and has been replaced by the odometry sensor.
  • In the following steps, you must attach four evenly-spaced magnets to the drive shaft. If additional magnets are required due to the structure of the drive shaft (for example, some shafts have a hexagonal cross section), contact your representative from Genetec Inc.
  • An odometry sensor installation includes the following hardware components:

    A Magnets
    B Tie straps (not included)
    C Mounting bracket
    NOTE: The bracket in the image has been customized to fit the specific installation.
    D Odometry sensor
    E Bolt from the engine block or transmission case (or use self-taping screws)
    F Odometry sensor cable


  1. Raise and support the vehicle so that you can work on the drivetrain.
    • Never get under any vehicle that is only supported by jacks. Use jack stands or ramps.
    • Do not use concrete blocks to support the vehicle.
    • Always chock the wheels of the vehicle and set the parking brake.
  2. Remove the existing magneto coil and magnets.
    The odometry sensor cannot detect the old magneto coil magnets. Do not reuse them.
  3. Decide on a mounting location for the odometry sensor.
    • The sensor must be as close as possible to the magnets (maximum distance 1.9 cm (¾ in.)).
    • The surface on which the mounting bracket is attached must not move in relation to the magnets, meaning that the distance between the sensor and the magnets must be consistent, even when driving on rough surfaces. The odometry sensor will be damaged if it comes in contact with the magnets during vehicle operation.
    • To minimize the lateral movement experienced by the sensor, install it as close as possible to the output of the transmission or differential.

    The following drivetrain locations are recommended:

  4. Mount the sensor bracket.
      • Self-tapping screws are provided to attach the bracket to a surface under the vehicle, however, it is recommended that you use appropriate bolts, nuts and lock washers to secure the bracket. If possible, use an existing bolt from the transmission case or differential case.
        WARNING: If you must drill through the floor pan to mount the bracket (not recommended, as the motion of the floor does not match the motion of the drive shaft), ensure that you do not damage fuel or electrical lines that might be embedded in the floor pan.
    • If you are mounting the bracket to a crossmember, drill 0.5 cm (3/16 in.) holes and attach the bracket with 0.6 cm (¼ in.) tapping screws.
    • If a transmission bolt is used, drill the bracket as required to widen the hole.
    • If you are only able to use one bolt or screw to attach the bracket, bend the bracket over an edge to prevent it from spinning.
    • The installation examples included here show the odometry sensor mounted below the drive shaft. Note that the sensor can be oriented in any direction in respect to the drive shaft.
  5. Remove the protective rubber cap from the sensor and attach the sensor to the sensor bracket, as close to the end of the bracket as possible.
    Install a lock washer and a nut on each side of the bracket. Hand-tighten the nuts. The connection will be fully tightened at the end of the installation.
  6. Bend the bracket as needed to aim the sensor at a point on the middle of the drive shaft.
    • To reduce vibration, bend the bracket so that it is as short as possible.
  7. Prepare the magnet mounting location.
    • Use the included sandpaper to remove surface rust from the expected magnet locations around the shaft.
    • If the magnet locations are already clean and rust-free, use sandpaper to roughen the surface to ensure that the epoxy adheres.
    • Use the included alcohol wipe to clean the expected magnet locations.
  8. Mount the magnets on the shaft.
    1. Wrap a strip of paper around the shaft.
    2. Mark the circumference of the shaft and cut the paper to match.
    3. Fold the paper in half twice, dividing it into four equal sections. Make the creases more visible using a marker. The creases will show the mounting location for the magnets.
    4. Wrap the strip of paper around the shaft and use a piece of tape to hold the paper in place.
  9. Secure the magnets to the shaft.
    IMPORTANT: The supplied epoxy hardens in 5 to 10 minutes. Read through the rest of the steps and prepare your work before securing the magnets.
    1. Position the strip of paper so that the magnets will be installed beside the paper, directly in line with the sensor.
    2. Prepare the epoxy according to the instructions on the package.
    3. Apply epoxy to the back of the magnets and position the magnets beside the start of the paper, and beside each crease.
    4. Secure the magnets using two tie straps (not included), making sure that the tie straps sit between the notches on the sides of the magnets. To tighten the tie straps, place the blade of a screwdriver against the tie strap lock and use pliers to pull on the strap end.
    5. Cut off any excess strap and ensure that the tie strap locks do not contact the sensor when the shaft rotates.
    6. Check that the magnets did not shift during tightening.
  10. Adjust the sensor in the bracket so that the gap between the sensor and the magnets is no greater than 1.9 cm (¾ in.). Reposition the sensor, if required. When the sensor is in its final position on the mounting bracket, tighten the sensor mounting nuts to 23 lbf*ft (31 Nm).
  11. Check for an existing hole in the floor pan that is suitable for passing the sensor cable to the Navigator box.
    If you cannot find an appropriate hole in the floor pan, you can drill a hole and insert a cable gland to protect the cable.
    WARNING: Fuel lines and electrical cables are sometimes embedded in a vehicle's floor pan. Do not drill through the floor pan unless you are sure there are no hidden obstacles.
  12. Run the cable to the Navigator box using a wire loom to protect the wires.
    WARNING: Make sure that wires are routed away from exhaust pipes, shift rods, or any other hot or moving parts.
  13. Connect the odometry sensor cable to the Navigator box as shown.
    NOTE: 12V power for the odometry sensor is provided by the Sharp camera connector.