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How do I get my computer head unit to register a signal with the sensor?
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If you computer head unit does not pick up a signal or does not seem to "communicate" with the sensor - check the following:

First, make sure the "AT" icon or "AUTO" is displayed on the screen (computer is in auto-timer mode, not manual stop/start mode).

Second, make sure the magnet is passing within 2-3 mm of the mark on the sensor (on the fork blade or chainstay, depending on model).

If neither help restore a consistent signal, then it could be either a low battery or a damaged wiring (Bracket/Sensor) kit.

Even if the LCD display is clear and bright, the battery may be too low to transmit a signal from the sensor to the computer head unit.

Next, with a fresh battery installed, try performing a manual restart operation to bring the LCD display back to life.  Do this by either 1. pressing both buttons (Mode and Set on back) OR 2. all three buttons (Mode, Start/Stop, and small Set button on back) at once and then releasing all three OR 3. by pressing the AC (all-clear) button if your computer has one.  This should bring the display back to life, and the unit can now be re-calibrated for your bike.  See if consistent signal is re-established.

Finally, If that does not help, take a paper clip and bridge the 2 diagonally opposed metal contacts on the back of the computer head unit.  If random information appears in the current speed display (upper portion of screen) while bridging the contacts, then the computer head unit is fine and the problem lies with the bracket/sensor kit.  It may be stretched or damaged just enough to interrupt the signal transmission, even if not visibly so.  If that is the case, please visit our small parts site to purchase the appropriate replacement sensor kit. 
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