Mercury - Power Trim Gauge Trim Position Monitoring White Face Brushed Bezel 79-8M6020066. OverviewThis power trim gauge gives you a calm, steady look at where the engine's sitting as you adjust trim. The needle moves in a smooth, predictable sweep, so you're not fighting jumpy readings when the boat hits chop or shifts weight. Out on the water, it feels natural to check-just a quick glance before settling back into the run. It's a simple tool that makes dialing in the ride a little easier.. Key