859689A1 Mercury Oil Pressure Gauge | Genuine Used Part

🔧 Product Description

Genuine Mercury Quicksilver Flagship 0-80 PSI Oil Pressure Gauge - Part Number: 79-859689A1

A genuine used Mercury Quicksilver Flagship oil-pressure gauge for compatible MerCruiser petrol engines and Mercury four-stroke outboards.

The 0-80 PSI analog instrument uses a matching resistive pressure sender and features a black face, blue graduations, black bezel and marine illumination.

⚙️ Key Features

• Genuine Mercury Quicksilver OEM Flagship oil-pressure gauge
• Correct Mercury part number 79-859689A1
• 0-80 PSI pressure scale
• Black face, blue graduations and black bezel
• Complete 825288A1 / 859689A1 / 895289A01 supersession family

🚤 Compatibility

Commonly used on

• MerCruiser petrol sterndrive and inboard oil-pressure systems
• Mercury and Mariner four-stroke outboards using a compatible pressure sender

Typically suits

• Engine models:
• MerCruiser 4-cylinder petrol engines with a matching 0-80 PSI sender
• MerCruiser GM V6 petrol sterndrive and inboard engines with a matching sender
• MerCruiser GM and Ford V8 petrol sterndrive and inboard engines with a matching sender
• Mercury / Mariner four-stroke outboards fitted with compatible analog oil-pressure instrumentation
• HP Range: Not restricted by horsepower; sender and pressure range controlled
• Engine Type: MerCruiser petrol inboard / sterndrive and compatible Mercury four-stroke outboard
• Year Range: Approximately 1990s - 2000s

🔌 Function

The gauge converts the oil-pressure sender's changing resistance into a PSI reading. It allows the operator to confirm pressure after starting and detect potentially damaging pressure loss while underway.

⚠️ Common Signs of Failure

• Gauge remains at zero despite verified mechanical oil pressure
• Gauge moves to maximum because the sender circuit is shorted
• Needle fluctuates because of a loose sender or ground connection
• Incorrect sender resistance causes an inaccurate reading
• Gauge illumination or internal movement fails

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 79-895289A01 → Supersedes 79-859689A1
• 79-859689A1 → Supersedes 79-825288A1
• 79-825288A1 earlier OEM oil-pressure gauge reference

OEM / Related Numbers

• 79-859689A1
• 859689A1
• 79859689A1
• 79-825288A1
• 825288A1
• 79-895289A01
• 895289A01
• 745061034907

Aftermarket / Verified Equivalents

• Sierra: 57903P - Amega 0-80 PSI oil-pressure gauge
• Sierra: 59705P - 0-80 PSI oil-pressure gauge
• Veethree: 62720P - Premier Pro 0-80 PSI oil-pressure gauge
• Stewart-Warner: 82113 - Deluxe 0-80 PSI oil-pressure gauge

📦 Condition

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