825734 895288A01 Mercury Water Gauge | Genuine Used Part

🔧 Product Description

Genuine Mercury Quicksilver Flagship 1-15 PSI Water Pressure Gauge - Part Number: 79-825734A1

A genuine used Mercury Quicksilver Flagship mechanical water-pressure gauge for compatible Mercury, Mariner and Force outboard cooling systems.

The gauge displays 1-15 PSI from a small pressure hose connected to the engine cooling-water circuit. The later complete-kit version includes approximately 25 feet / 7.6 metres of tubing and connection hardware.

⚙️ Key Features

• Genuine Mercury Quicksilver OEM water-pressure gauge
• Original Mercury part number 79-825734A1
• 1-15 PSI mechanical pressure range
• Black face, blue graduations and anti-fog lens
• Complete five-number OEM supersession history

🚤 Compatibility

Commonly used on

• Mercury and Mariner outboard mechanical water-pressure systems
• Force outboards using the compatible 1-15 PSI cooling-water take-off

Typically suits

• Engine models:
• Mercury / Mariner 25 E and 25 EL - US serial 0C192155 and above
• Mercury / Mariner 25 E and 25 EL - Belgium serial 9548742 and above
• Mercury / Mariner 30HP through 125HP two-stroke outboards, excluding four-stroke models
• Mercury V6 3.0L outboards produced through 1998 where the 1-15 PSI gauge is specified
• Force 40HP and 50HP outboards using the compatible cooling-water pressure connection
• HP Range: 25HP - 125HP where the 1-15 PSI system is specified
• Engine Type: Mercury / Mariner two-stroke and Force outboard
• Year Range: Approximately late 1980s - 1998, with serial-controlled applications

🔌 Function

The gauge receives cooling-water pressure through a small hose and displays the pressure produced by the water pump. It helps identify restrictions, impeller wear and loss of cooling-water flow while the engine is operating.

⚠️ Common Signs of Failure

• Gauge remains at zero despite visible cooling-water flow
• Blocked pressure hose or engine fitting prevents a reading
• Needle fluctuates because air or debris is trapped in the hose
• Split hose or loose fitting leaks water or pressure
• Internal pressure movement sticks or fails

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 79-895288A01 → Supersedes 79-859687A1
• 79-859687A1 → Supersedes 79-858649A3
• 79-858649A3 → Supersedes 79-858649A1
• 79-858649A1 → Supersedes 79-825734A1
• 79-825734A1 earlier OEM water-pressure gauge reference

OEM / Related Numbers

• 79-825734A1
• 825734A1
• 825734
• 79825734A1
• 79-858649A1
• 79-858649A3
• 79-859687A1
• 79-895288A01
• 895288A01

Aftermarket / Verified Equivalents

• Veethree / Amega: 58392E - 0-15 PSI outboard water-pressure kit
• Veethree: 112376 - Lido Pro water-pressure gauge kit

📦 Condition

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