Mercury - Digital Trim Sender Kit 40-60 HP FourStroke 8M0109720. Overview. The Mercury Digital Trim Sender Kit (8M0109720) upgrades your 40-60 HP FourStroke outboard from analog to SmartCraft digital trim. It replaces the original sender with a factory digital version, letting your engine talk directly to your SmartCraft display. Once installed, you'll see precise trim readings on systems like VesselView, SC100, or MercMonitor.. It's a simple, plug-and-play upgrade that adds accuracy and SmartCr