Display only. What is shown in the pictures is what you get. The rest of it is installed in a vehicle that is no longer with us.

The AEM Wideband Oxygen Sensor Gauge Display is a standalone unit that displays real-time air/fuel ratio readings. It is compatible with AEM's wideband UEGO sensors and features a 0-5V analog output for data logging or engine management systems. The gauge has a bright LED display. The product is shipped quickly and is suitable for car and truck air and fuel delivery systems.