Mercury – Quicksilver 815956A1 Speedometer Hose Coupling Kit | MerCruiser Alpha One Sterndrives | 815956A1

Overview

Your speedometer’s only as accurate as the connection behind it. The Quicksilver 815956A1 Speedometer Hose Coupling Kit is a simple but essential fix for keeping your speedometer system working like it should. Designed for MerCruiser Alpha One sterndrives (1991–1997), this OEM coupling ensures a tight, leak-free connection between the speedometer hose and the drive unit.

It’s a small part, but it saves you from one of boating’s common annoyances — an unreliable or dead speedometer caused by air leaks or a brittle old fitting.

Key Features

• Purpose: Replaces worn or cracked speedometer hose couplings for accurate and steady speed readings.
• Fitment: Designed for MerCruiser Alpha One sterndrives built between 1991 and 1997.
• Construction: Precision-molded from durable marine-grade materials to resist cracking, vibration, and exposure to water.
• Ease of Use: Installs quickly with common hand tools — no special equipment required.
• OEM Quality: Manufactured to Mercury Marine factory specifications for proper fit and dependable performance.

Engine & Boat Compatibility

• MerCruiser Alpha One sterndrives (1991–1997 models)
• Found on a wide range of runabouts, cruisers, and sport boats

Performance & Practical Benefits

A failing speedometer connection can cause inaccurate readings or total gauge failure. The 815956A1 Coupling Kit restores that sealed connection so water pressure readings from the lower unit reach the gauge correctly. You’ll get steady, accurate speed readings again — no bouncing needles or false zeros.

Because it’s an OEM part, it fits perfectly and seals tightly the first time. The tough marine-grade material stands up to vibration and heat without becoming brittle, so you can trust it season after season. It’s one of those small, inexpensive fixes that restores function to a system many boaters overlook.

Why Buy OEM

Mercury designs its OEM fittings to survive real marine use — constant motion, moisture, and UV exposure. Aftermarket couplers often use plastic blends that dry out or crack, leading to air leaks and unreliable performance.

With a genuine Quicksilver coupling, you get the same precision fit and long-term durability Mercury builds into every drive. It’s a simple swap that gives your boat’s instrumentation the accuracy it was designed for.

FAQ

Q1: Which drives use the Quicksilver 815956A1 kit?
A: It’s made for MerCruiser Alpha One sterndrives (1991–1997).

Q2: What does this kit do?
A: It connects the speedometer hose to the drive unit, maintaining pressure for accurate readings.

Q3: Is it difficult to install?
A: Not at all. It’s an easy job using common tools and basic mechanical knowledge.

Q4: Can I use aftermarket couplers?
A: You can, but OEM couplers are more precise, durable, and resistant to vibration and UV damage.

Q5: How often should it be replaced?
A: Replace it whenever the hose connection leaks or the plastic becomes brittle — typically every few seasons.