AEM Electronics Brass Atmospheric Pressure (PSIg) Sensors provide accurate and reliable monitoring of pressure referenced against atmospheric pressure, available in a variety of working pressure ranges*. Ideal for applications requiring the feedback of crucial ECU information or calibration data.Brass sensors are accurate to within 3% of full scale (pressure sensors)High-quality sealed sensor housings are virtually impervious to automotive fluids (360-degree welded wetted area)Connector and pins includedAEM's Gauge style pressure sensors reference pressure above atmospheric pressure. When exposed to atmospheric pressure, gauge style pressure sensors will read 0 PSIg. Gauge style pressure sensors are commonly used for applications such as oil pressure, fuel pressure, brake pressure, nitrous pressure etc. Brass sensors offer a smoother more stable or constant feedback to pressure changes when compared to their equivalent stainless steel sensors, making them ideal for applications where y