Using these Briggs LO206 carburetor slide gauges is easy. First, pick the right gauge for your needs based on the color - red, green, or yellow. Then, check the slide opening of your carburetor. Put the gauge at the opening to see if it fits. This helps you make sure the slide is opening to the maximum legal limit. When using the gauges, handle them gently to avoid any damage. After each use, clean the gauges with a soft cloth to keep them in good condition. Store them in a dry place to prevent rust. With these gauges, you can keep your carburetor in top - notch shape for better performance.