Sensor on the left is from an LS7 harness. Sensor on the right is from a Holley Terminator X wiring harness. GM sensor has about 50,000 kms on it. The Holley sensor is practically new. Was in the car while we traced an engine issue, that's it. Holley sells 'em for ~$250 new. Will sell separately. GM for $75. Holley for $150.