Mercury – Water Pressure Gauge 0–30 PSI | Cooling System Monitoring | White Face | Brushed Bezel | 79-8M6020067Mercury Water Pressure Gauge 030 PSI Cooling System Monitoring White Face Brushed Bezel 79 8M6020067 OverviewThis 030 PSI water pressure gauge gives you a steady read on how well the engine is pulling water through the cooling system. The needle moves with a smooth, relaxed swing, so you can catch real changes without chasing jitter. Out on the water, it reacts the way you expectwhether youre trimming up, running skinny, or pushing through a bit of