Mercury – Water Pressure Gauge 0–30 PSI | Cooling System Monitoring | Black Face | Brushed Bezel | 79-8M6020043Mercury Water Pressure Gauge 030 PSI Cooling System Monitoring Black Face Brushed Bezel 79 8M6020043 OverviewThis 030 PSI water pressure gauge gives you a straightforward feel for how well the engines pulling water through the cooling system. The needle moves in a smooth, relaxed way, so you can spot changes without guessing. Out on the water, it reacts the way you expectwhether youre getting on plane, trimming up, or running a skinny stretch. Its a