Pressure sensors for shield tunneling are critical for safe and efficient tunnel excavation. The tunnel boring machine (TBM) must maintain proper face pressure to support the surrounding soil and protect nearby buildings, roads, and utilities. Real-time pressure monitoring allows operators to adjust thrust, cutterhead speed, and slurry or soil discharge, reducing the risk of collapse, over-excavation, and surface settlement. These sensors are built for harsh underground conditions. They resist vibration, shock, moisture, mud, and high pressure while delivering stable and accurate signals. Common measurement points include the excavation chamber, slurry pipeline, grouting system, and shield tail. By monitoring soil pressure, slurry pressure, and grouting pressure, the control system can maintain balance and issue early warnings when values exceed safe limits. Accurate data also supports automatic control, construction records, and quality assessment. Proper installation, shielding, and regular calibration help extend sensor life and improve reliability. For urban tunnels, subway projects, and cross-river passages, pressure sensors for shield tunneling provide essential data for risk control, operational safety, and project quality. Reliable pressure sensors therefore help contractors optimize TBM performance, improve safety management, and complete shield tunneling projects with greater confidence in challenging geological conditions. They also reduce downtime and maintenance costs.