Mercury - Trim Sender Digital 140 Horsepower FourStroke Digital Trim Feedback 8M0076463. Overview. Most boaters do not think about their trim sender until it stops doing its job. When it works the way it should, it feels almost invisible-quietly telling you where the engine sits as you ease onto plane or settle into a long run. The Mercury Digital Trim Sender for 140 horsepower FourStroke engines brings that same easy confidence back into your setup. It gives you clean, steady trim information w