859678A1 895285A04 Mercury Speedometer | Genuine Used Part

🔧 Product Description

Genuine Mercury Quicksilver Flagship 10-80 MPH Speedometer - Part Number: 79-859678A1

A genuine used Mercury Quicksilver Flagship pitot speedometer with a 10-80 MPH scale for higher-speed marine applications.

The black-face instrument uses water pressure from a compatible pitot pickup to display vessel speed and does not require an electronic speed sensor.

⚙️ Key Features

• Genuine Mercury Quicksilver OEM Flagship speedometer

• Correct Mercury part number 79-859678A1

• 10-80 MPH speed range

• Black face, blue graduations and black bezel

• Complete 825285A1 / 827875A1 / 859678A1 / 895285A04 family

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 79-895285A04 → Supersedes 79-859678A1

• 79-859678A1 → Supersedes 79-827875A1

• 79-827875A1 → Supersedes 79-825285A1

• 79-825285A1 earlier OEM 80 MPH speedometer reference

OEM / Related Numbers:

• 79-859678A1

• 859678A1

• 79859678A1

• 79-827875A1

• 827875A1

• 79-825285A1

• 79-895285A04

• 895285A04

Aftermarket / Verified Equivalents:

• Sierra: 63076P - 20-80 MPH pitot speedometer

• Sierra: 62723P - Premier Pro 20-80 MPH pitot speedometer

🚤 Compatibility

Commonly used on:

• Mercury Flagship-series high-speed boat dashboards

• Pitot-pressure systems using a compatible transom or gearcase pickup

Typically suits:

• Engine models:

• Performance Mercury and Mariner outboard-powered boats with a pitot pickup

• MerCruiser Alpha and Bravo sterndrive boats using a compatible gearcase pitot pickup

• Inboard performance boats fitted with an independent pitot pickup

• HP Range: Not engine-specific

• Engine Type: Outboard, sterndrive or inboard performance boat with pitot-pressure speed system

• Year Range: Approximately 1990s - 2000s

🔌 Function

The speedometer converts water pressure created at the pitot pickup into an indicated MPH reading. A clear pickup, correctly routed hose and airtight fittings are required for accurate operation.

Common signs of failure:

• Gauge does not register speed

• Pitot pickup or lower-unit passage is blocked

• Pressure hose leaks, kinks or disconnects

• Reading fluctuates because of air or water trapped in the line

• Internal diaphragm or needle mechanism fails

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated