Aluminum Oxygen Sensor Mounting Plate for Mercruiser V8 V6 Engines Easy Installation Boat Sensor Replacement Features： 1、Applicable Model: The boat oxygen sensor plate is replacement for Mercruiser V?8 V?6 engines and out drives. Please confirm whether it is consistent with the product you want before buying to avoid unnecessary return. 2、Enhanced Performance: The oxygen sensor mounting plate allows for easy installation of oxygen sensors on boat engines. Aftermarket EFI systems require oxygen sensors to run in closed loop mode for maximum performance and fuel economy. 3、Efficient Use: Oxygen sensor samples exhaust gases to optimize injector rate and ignition timing for maximum efficiency. O2 sensor and gauge can read air fuel ratio accurately for carbureted engine tuning. 4、Easy Installation: The aluminum oxygen sensor plate mounts between manifold and riser with threaded ports for standard O2 sensor installation. Aluminum construction ensures durability and longevity. 5、 Material: Made of high strength aluminum, the sensor mounting plate is sturdy and reliable, resistant to wear and tear, enhancing your engine's performance. Specification： Item Type: Oxygen Sensor Mounting Plate Material: Aluminum Fitment: Replacement for Mercruiser most V-8 and V-6 engines Replacement for Mercruiser most out drives. Package List： 1 x Mounting Plate 2 x Washers