Mercury – Quicksilver Low Oil Pressure Switch | For MerCruiser Sterndrive & Inboard Engines | 805605A1

Overview

When oil pressure drops, you need to know right away. The Mercury Marine 805605A1 Quicksilver Low Oil Pressure Switch is built to do exactly that — sending a signal to your boat’s warning system the instant pressure falls below a safe level. Designed for MerCruiser sterndrive and inboard engines, this OEM switch helps prevent major engine damage by giving you early notice before things get serious. It’s durable, accurate, and easy to install, making it one of those simple parts that can save your engine — and your weekend — from disaster.

Key Features

• Purpose: Activates the low-oil-pressure alarm to protect your engine from internal damage.
• Construction: Made with marine-rated materials that resist corrosion and vibration.
• Performance: Delivers reliable, real-time pressure readings for consistent warning signals.
• Design: Compact, precise, and built to meet factory specs for MerCruiser engines.
• Ease of Use: Installs quickly with common shop tools — no wiring modifications required.

Engine & Boat Compatibility

• Designed for MerCruiser sterndrive and inboard engines
• Works with factory-installed audio warning systems

Performance & Real-World Benefits

The 805605A1 pressure switch gives you a crucial layer of protection. If your oil pressure dips too low, it instantly triggers your warning buzzer, allowing you to shut down the engine before serious damage occurs. It’s a small part, but it plays a big role in keeping your motor healthy.

This OEM switch is built for the marine environment — it can handle moisture, temperature swings, and vibration without false signals or failure. Once installed, you can trust that your warning system will respond exactly when it should — no more, no less.

Why Choose Mercury OEM

The Quicksilver 805605A1 is the same low-oil-pressure switch used on new MerCruiser engines at the factory. Aftermarket versions may look similar but can give inconsistent readings or fail prematurely due to lower-quality internal components.

Mercury’s OEM design ensures exact calibration and long-term reliability, even in the punishing conditions marine engines face. It’s a genuine part made to protect your investment — not a shortcut.

FAQ

Q1: What does this switch do?
It triggers your engine’s audio warning system when oil pressure drops below a safe limit.

Q2: What engines is it used on?
It’s built for MerCruiser sterndrive and inboard engines with integrated warning systems.

Q3: How do I know if mine needs replacing?
If your alarm fails to sound or gives false alerts, the switch may be faulty.

Q4: Is it hard to install?
No — it’s a direct-fit OEM part and can be installed easily with standard tools.

Q5: Why use OEM instead of aftermarket?
OEM parts are factory-calibrated, corrosion-resistant, and tested for marine use, ensuring accuracy and longevity.