Mercury – Quicksilver Engine Coolant Temperature Gauge Sender | For MerCruiser Sterndrives & Inboards | 805218T

Overview

When you’re out on the water, knowing your engine’s temperature isn’t just convenient — it’s critical. The Mercury Marine 805218T Quicksilver Engine Coolant Temperature Gauge Sender gives you accurate, real-time temperature readings for your MerCruiser sterndrive or inboard engine. Designed and tested to Mercury’s exacting standards, it provides dependable readings that help prevent overheating and protect your engine from costly damage. Built tough and easy to install, this sender ensures your gauge tells the truth every time you glance down at the dash.

Key Features

• Purpose: Measures and transmits engine coolant temperature to your dashboard gauge.
• Construction: Made from marine-grade materials for lasting durability and corrosion resistance.
• Performance: Ensures accurate, consistent readings to protect against overheating.
• Installation: Designed for easy replacement with standard shop tools.
• Quality: OEM-built to Mercury Marine specifications for precise fit and long life.

Engine & Boat Compatibility

• Designed for MerCruiser EFI sterndrive and inboard engines
• Compatible with Quicksilver instruments and Mercury gauge systems

Performance & Real-World Benefits

The 805218T temperature sender plays an essential role in keeping your engine safe. By providing accurate coolant temperature readings, it allows you to spot overheating issues early — before they become serious. A failing or inaccurate sender can lead to poor readings or no readings at all, leaving you guessing about your engine’s condition.

This OEM sender restores confidence in your gauge readings. It’s built to withstand marine heat cycles, vibration, and corrosion — the kinds of stress your boat sees on every trip. Once installed, it delivers reliable, consistent performance season after season.

Why Choose Mercury OEM

The Quicksilver 805218T is a genuine Mercury Marine part, engineered specifically for MerCruiser engines and gauges. Aftermarket sensors can sometimes send inaccurate readings or fail prematurely due to inferior materials.

Mercury’s OEM senders are calibrated precisely for their gauge systems and tested under harsh marine conditions to guarantee long-term accuracy. It’s the same sensor Mercury technicians use to protect engines at the factory and in service bays around the world.

FAQ

Q1: What engines does this sender work with?
It’s made for MerCruiser EFI sterndrive and inboard engines.

Q2: What does this part do?
It sends coolant temperature readings to your dash gauge so you can monitor engine heat.

Q3: Is it hard to install?
No — it’s a direct OEM replacement that installs easily with basic tools.

Q4: Why replace it?
An old or faulty sender can cause false readings, leaving you unaware of overheating issues.

Q5: Why OEM instead of aftermarket?
Mercury OEM parts are precision-calibrated and marine-tested, ensuring accurate readings and long-lasting reliability.