Upgrading your diesel truck with a Fuel Rail Pressure Gauge shouldn’t mean cutting into factory wiring or spending hours under the hood. That’s why we made a Fuel Rail Pressure Gauge Wiring Harness engineered specifically for 2002–2016 Chevrolet Silverado and GMC Sierra 1500, 2500HD & 3500HD models with a 6.6L Duramax.

Designed for LB7, LLY, LBZ, LMM, LML and LGH engines, this 6.6 Duramax wiring harness installs directly to the factory fuel rail pressure sensor using true plug and play connectivity. Instead of splicing into OEM wiring, simply disconnect the rail pressure harness connector and insert our pigtail harness between the factory sensor and harness. The result is a clean, professional installation that preserves your truck’s factory wiring integrity.

At 6 inches long with 9 inch sensor and ground lead wires, this harness provides ample length for a streamlined routing setup. Once connected, just match the green and black wires from your fuel rail pressure gauge harness to the corresponding wires on the 6.6 Duramax wiring harness. In minutes, you’ll be ready to accurately monitor fuel rail pressure readings directly from the common rail system.

Whether you rely on your Silverado or Sierra for towing, performance driving or daily work, keeping an eye on fuel rail pressure is critical for maintaining engine health and optimizing performance. We make the process straightforward so you can focus on what matters—getting the most out of your Duramax diesel truck.

Step-by-step installation instructions will walk you through the process. Every purchase is also backed by Free Lifetime Tech Support which means we’re here to assist now or later on down the road if you ever have any questions.

It’s an effortless, reliable, plug and play remedy built specifically for 2002–2016 GM 6.6L Duramax 1500, 2500HD & 3500HD trucks.