Mercury – Water Pressure Gauge 0–30 PSI | Cooling System Monitoring | White Face | Chrome Bezel | 79-8M6020019Mercury Water Pressure Gauge 030 PSI Cooling System Monitoring White Face Chrome Bezel 79 8M6020019 OverviewThis 030 PSI water pressure gauge gives you a clear, steady read on how well the engine is pulling water through the cooling system. The needle settles with a smooth, even swing, so real changes stand out without getting lost in bumps or chop. Out on the water, it turns into a quick habitglance, confirm, and keep moving. Its a simple, clean