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This sensor is designed to send a wheel speed signal to Stack Data Logging Dash systems and Tachometers. It is designed to use the signal from your vehicle's speedometer sensor,* amplifying and turning it into a signal the Stack system can understand. This eliminates the need to install a second speed sensor.
*Note: Not for use with ABS sensors. Tapping into the ABS signal can cause unpredictable problems with the braking system.