Our Fuel Rail Pressure harness for the 2011 2016 6.6L Duramax is a direct replacement for GM Part Numbers 12647115 and 12638158. Produced in house, our manufacturing process includes fully automated wire cutting and terminal crimping to ensure you get the highest quality replacement parts you need to get your truck back on the road quickly. Replaces discontinued GM part number 12647115 and 12638158 APPLICATION NOTES 2011 2016 6.6L Duramax Fuel Rail Pressure Harness This harness routes underneath the turbocharger and connects to the main chassis harness.