Mercury – Quicksilver Engine Water Temperature Gauge Sender | For MerCruiser Sterndrive & Inboard Engines | 806490T

Overview

Your temperature gauge is only as reliable as the sender feeding it data. The Mercury 806490T Quicksilver Water Temperature Sender is built to keep you in the know — accurately reporting your engine’s water temperature so you can spot problems before they get expensive. Designed specifically for MerCruiser sterndrive and inboard engines, this OEM sensor gives steady, true readings even after years of heat, vibration, and salt exposure. It’s simple to install, built to last, and trusted by boaters who care about their engines as much as their time on the water.

Key Features

• Purpose: Monitors engine cooling temperature and relays it to your dash gauge.
• Build Quality: Constructed from marine-grade materials that resist corrosion and wear.
• Performance: Calibrated for precise, consistent readings in demanding marine environments.
• Ease of Use: Installs quickly using basic hand tools — no rewiring or modifications needed.
• Compatibility: Designed to work perfectly with Mercury and Quicksilver gauge systems.

Engine & Boat Compatibility

• MerCruiser sterndrive engines
• MerCruiser inboard engines

Performance & Real-World Benefits

The 806490T sender does the quiet work that protects your engine. When it’s functioning properly, you’ll always know your motor’s true running temperature, helping you catch issues like clogged intakes or a weak impeller before they cause overheating.

Because it’s marine-rated, this sender holds up to the conditions your boat lives in — salt spray, constant heat cycles, and vibration. Once installed, it feeds your gauge smooth, accurate readings you can trust every time you glance at the dash. It’s the kind of small part that delivers peace of mind every time you push the throttle forward.

Why Choose Mercury OEM

The Quicksilver 806490T is built by the same people who designed your engine, and that matters. While aftermarket sensors may fit, they often send erratic readings or fail after one season. Mercury’s OEM sender is tested for precision and corrosion resistance under real boating conditions, so you know you’re getting the same quality and reliability found in new engines from the factory.

With Mercury OEM, you’re not just buying a part — you’re protecting your investment and ensuring your gauges tell the truth.

FAQ

Q1: What engines is it made for?
It fits MerCruiser sterndrive and inboard engines.

Q2: Why replace the sender?
If your temperature gauge reads inconsistently or not at all, this sender restores proper communication.

Q3: How hard is installation?
It’s a simple, bolt-in replacement using basic tools.

Q4: Will it work with my existing gauge?
Yes — it’s designed for Mercury and Quicksilver instruments.

Q5: Why stick with OEM?
Because Mercury OEM sensors deliver factory-calibrated accuracy and marine-proven durability that aftermarket parts can’t match.