The LFP Boost Overlay is a clear self-adhesive vinyl overlay that installs over your stock boost gauge. When installed, the LFP Boost Overlay will accurately measure up to 16 pounds of boost while maintaning your stock needle and appearance.No cutting, drilling, gluing, or additional plumbing is required.Proper calibration is required in order for your stock needle to read to proper amount of boost. Detailed instructions are included to take you through this step by step.