SPEED SENSOR PRO KIT - Includes speed sensor, wiring harness, and installation instructions. The Garrett® Turbocharger Speed Sensor Kit offers the ability to monitor the inner workings of your turbocharger to insure longer life and maximum performance at an affordable price! By constantly monitoring your turbocharger's shaft speed through either a data logger or the Garrett®-branded speed sensor gauge, you acquire a more complete picture of your turbocharger's performance.