# 8043071 Mercury Oil Pressure Switch | Genuine Used Part

## 🔧 Product Description

**Genuine Mercury Mariner 75HP-115HP Four-Stroke Oil-Pressure Switch - Part Number: 8043071**

A genuine used Mercury / Mariner oil-pressure switch for Yamaha-derived 75HP to 115HP four-stroke outboard motors.

The switch monitors lubrication pressure and sends a warning or engine-management signal when pressure falls below its calibrated threshold. It directly cross-references Yamaha oil-pressure switch 68V-82504-00-00.

## ⚙️ Key Features

-   Genuine used Mercury Marine oil-pressure switch
-   Correct OEM part number 8043071
-   Yamaha equivalent 68V-82504-00-00
-   Used on carburetted and EFI four-stroke engines
-   Threaded pressure-switch design

## 🚤 Compatibility

### Compatible Mercury / Mariner serial groups include

-   75HP carburetted four-stroke: 0G960500-0T800999 and 0T801000-1B226999
-   75HP Bodensee carburetted: 0G960500-0T800999 and 0T801000-1B226999
-   75HP EFI: 1B172291-1B366822
-   80HP EFI: 1B227000-1B366822
-   90HP carburetted four-stroke: 0G960500-0T800999 and 0T801000-1B226999
-   90HP EFI: 1B172291-1B366822
-   100HP EFI: 1B227000-1B366822
-   115HP EFI: 0T178500-0T800999, 0T801000-1B226999 and selected 1B227000-1B366822
-   Yamaha F75, F80, F90, F100 and F115 engines using 68V-82504-00-00
-   Engine Type: Yamaha-derived inline four-cylinder four-stroke outboard
-   Production Range: Approximately 1999-2006 for Mercury-branded applications

## 🔌 Function

The switch detects engine-oil pressure and triggers the warning or protection system when pressure is below the calibrated safe level.

## ⚠️ Common Signs of Failure

-   Low-oil-pressure warning remains active
-   Warning does not operate during an actual pressure loss
-   Switch leaks oil through the body or threads
-   Electrical terminal is corroded
-   Warning is intermittent
-   Switch calibration has drifted
-   Engine-management fault is stored

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   8043071 current Mercury reference for the Yamaha-derived engine family
-   Yamaha 68V-82504-00-00 is the verified other-brand equivalent

### OEM / Related Numbers

-   8043071
-   Yamaha 68V-82504-00-00
-   Related sealing washer or thread sealant as specified
-   Related engine harness and warning-system components
-   Related oil pump 858579T3
-   Related dipstick 8596021

### Aftermarket / Verified Equivalents

-   Yamaha: 68V-82504-00-00 - direct OEM equivalent
-   No verified aftermarket equivalent

## 📦 Condition

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

## Details

- **Price:** 45.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Type:** Sensors & Senders
- **Tags:** Sawley’s AAM Used Parts – Oil Pumps & Components | Engine Lubrication Systems

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 45.00 AUD | In stock |

## Images

- 8043071 Mercury Oil Pressure Switch | Genuine Used Part
- 8043071 Mercury Oil Pressure Switch | Genuine Used Part - photo 2 of 3
- 8043071 Mercury Oil Pressure Switch | Genuine Used Part - photo 3 of 3

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/8043071-mercury-oil-pressure-switch-genuine-used-part)
> Updated: 2026-09-06