i have a aem wideband setup for sale, works great about a year and a half old/maybe 10000 miles, sensor never seen race gas. it is still in my car but i should be able to get it out this weekend. $170 shipped.
i pulled the setup off today, you will get the gauge, harnesses, instructions, sensor, bung for the sensor, and also the white face for the gauge if you want to use that instead of the black one.