827874A1 895285A03 Mercury Speedo | Genuine Used Part

🔧 Product Description

Genuine Mercury Quicksilver Flagship 10-65 MPH Speedometer - Part Number: 79-827874A1

A genuine used Mercury Quicksilver Flagship pitot speedometer with a 10-65 MPH scale for compatible marine pressure-tube speed systems.

The black-face gauge displays boat speed from water pressure supplied by a transom-mounted pitot pickup or compatible sterndrive gearcase pickup.

⚙️ Key Features

• Genuine Mercury Quicksilver OEM Flagship speedometer
• Original Mercury part number 79-827874A1
• 10-65 MPH speed range
• Black face, blue graduations and black bezel
• Complete 825284A1 / 827874A1 / 859677A1 / 895285A03 chain

🚤 Compatibility

Commonly used on

• Mercury Flagship-series boat instrumentation
• Pitot-tube speed systems using a compatible pressure hose and pickup

Typically suits

• Engine models:
• Mercury and Mariner outboard-powered boats with a transom-mounted pitot pickup
• MerCruiser Alpha and Bravo sterndrive boats using a compatible gearcase pitot pickup
• Inboard boats fitted with an independent transom pitot pickup
• HP Range: Not engine-specific
• Engine Type: Outboard, sterndrive and inboard boat with a pitot-pressure speed system
• Year Range: Approximately 1990s - 2000s

🔌 Function

The speedometer converts water pressure from the pitot pickup into an indicated boat speed. Pressure rises as vessel speed increases and is transmitted to the gauge through a small hose.

⚠️ Common Signs of Failure

• Gauge remains at zero while the boat is moving
• Pitot pickup or gearcase passage is blocked
• Pressure hose is split, kinked or disconnected
• Water trapped in the hose causes delayed or unstable readings
• Internal gauge diaphragm or movement fails

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 79-895285A03 → Supersedes 79-859677A1
• 79-859677A1 → Supersedes 79-827874A1
• 79-827874A1 → Supersedes 79-825284A1
• 79-825284A1 earlier OEM 65 MPH speedometer reference

OEM / Related Numbers

• 79-827874A1
• 827874A1
• 79827874A1
• 79-825284A1
• 79-859677A1
• 859677A1
• 79-895285A03
• 895285A03

Aftermarket / Verified Equivalents

• Sierra: 59704P - 10-65 MPH pitot speedometer kit
• Veethree: 112342 - Lido Pro 65 MPH speedometer kit

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated