Mercury - Power Trim Gauge Trim Position Monitoring White Face Black Bezel 79-8M6020054. OverviewThis power trim gauge gives you a steady, natural read on where the engine's sitting as you adjust trim. The needle moves with a smooth, predictable sweep, so you don't have to wrestle with jumpy readings when the boat shifts. Out on the water, it becomes one of those quick glance-and-go checks-easy to read, easy to trust. It's a simple tool that helps the boat feel a little more dialed in.. Key Feat