Edelbrock pressure sensors are intended for use with QwikData, QwikData 2 and other aftermarket data and engine management systems. If you are using another aftermarket data or engine management system check the sensors specifications with the manufacturer of your system. Sensors are provided with a dash 4 an adapter fitting and harness pigtail adapter for use with QwikData and QwikData 2 systems. Note: pressure sensors should not be mounted directly to engine as excessive vibration can destroy the sensor. Mount sensor remotely and connect to engine with properly rated hose or flexible tubing.