Mercury – Power Trim Sender | Starboard-Side Digital Trim Feedback | 891777A01

Overview

A trim sender might be small, but when it does its job right, the whole boat feels more predictable. The Mercury Power Trim Sender (891777A01) is the starboard-mounted sensor trusted on SmartCraft-equipped engines to keep your digital trim readings steady and honest. It’s the kind of part boaters rely on without thinking about it—until the day the gauge stops moving and the ride stops feeling quite right.

This sender brings your display back to life with clean, accurate trim feedback. Whether you’re easing the bow down to settle into chop or trimming up for a quick run across open water, it keeps the engine’s position and your gauge perfectly in sync. Simple, solid, and built the way Mercury intended.

Key Features

• Starboard-mounted digital trim sender for accurate position feedback
• Required for engines using digital gauges or SmartCraft displays
• Provides smooth, reliable trim angle updates in real time
• Marine-grade construction built to handle heat, vibration, and exposure
• Designed for clean, direct replacement on compatible Mercury engines
• Helps restore proper trim indication for safer and more predictable handling

Engine & Boat Compatibility

• Fits Mercury SmartCraft-compatible outboards and sterndrives
• Intended for digital gauge and SmartCraft applications
• Common on center consoles, bay boats, runabouts, pontoons, and cruisers
• Designed specifically for starboard-side trim sender mounting

Performance & Practical Benefits

This sender restores the kind of trim accuracy you can actually feel. When the reading on your gauge matches what the engine is doing, trimming becomes second nature again. You’ll notice the difference when you lift the bow into cleaner water, settle the boat in a following sea, or ease into a tight marina lane. The feedback is smooth and predictable, and it makes the boat feel more settled under your hands.

Built with durable materials and sealed to stand up to marine life, it handles saltwater, freshwater, heat, and hard use without drifting out of calibration. And because the fitment is exact, installation tends to be straightforward—pop the old one out, set this one in place, and your digital system starts talking again.

Why Buy OEM

With Mercury parts, the fit and communication are right from the start. Aftermarket senders may look similar, but they rarely match the long-term accuracy needed for digital trim systems. An OEM sender keeps your SmartCraft system reading cleanly, avoids the electrical quirks cheaper parts can cause, and gives you the kind of stability that lasts season after season.

On a part this important, doing it once—and doing it right—is worth it.

FAQ

Q1: Which engines does this trim sender fit?
It fits Mercury engines equipped with SmartCraft compatibility and digital trim gauge systems.

Q2: Why is this sender starboard-mounted?
Certain Mercury engines use a paired system, with the starboard sender responsible for digital position feedback.

Q3: How do I know if I need this part?
If your digital trim gauge is stuck, jumps around, or reads inaccurately, the sender is often the culprit.

Q4: Can it handle saltwater use?
Yes. It’s built for long-term durability in both saltwater and freshwater environments.

Q5: Is installation straightforward?
Most owners or technicians find it simple, especially on engines with clear access to the starboard trim mount.