• 859689A1 Mercury Oil Pressure Gauge | Genuine Used Part
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859689A1 Mercury Oil Pressure Gauge | Genuine Used Part

859689A1 Mercury Oil Pressure Gauge | Genuine Used Part

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🔧 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

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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