Using your K-Tuned Center Mount Fuel Pressure Gauge is a breeze. First, locate the center port on your fuel rail. Then, attach the gauge using the provided one-piece fitting. Make sure it's securely in place. When it comes to maintenance, regularly check the o - rings for any signs of wear or damage. If you notice any issues, replace them immediately to prevent fuel leaks. Also, keep the gauge clean by gently wiping it with a soft cloth. Avoid exposing the gauge to extreme temperatures or harsh chemicals. Always follow proper safety procedures when working with fuel systems.