Quicksilver Water Temperature Sender for MerCruiser Sterndrives and Inboards 806490T – OEM-fit, Corrosion-Resistant

Quicksilver 806490T is a direct-fit water temperature sender designed for MerCruiser sterndrive and inboard engines to provide accurate engine coolant temperature readings.

The 806490T sender unit is an OEM-spec replacement part from Quicksilver, engineered to match Mercury Marine standards and restore reliable temperature monitoring on compatible MerCruiser sterndrives and inboard engines. Built to withstand marine environments, this sender helps maintain accurate gauge feedback so you can spot overheating signs early and protect engine performance. Installation requires common shop tools and follows the guidance in your owner's or service manual for application-specific locations and replacement steps.

Which engines and models is this sender compatible with?

The 806490T is manufactured for use with a range of MerCruiser sterndrive and inboard applications. Compatibility depends on engine year and configuration, so always confirm fitment with your owner's manual or a Mercury parts guide before purchase.

• Designed to meet Mercury Marine original equipment specifications.
• Commonly used across MerCruiser sterndrive and many inboard engines.
• Fits models that accept the 806490T part number as OEM replacement.
• Verify engine serial and manual for exact application details.

How easy is the 806490T to install?

Installation is straightforward for technicians and experienced DIYers when following the engine’s service instructions. You’ll typically remove the old sender, thread in the new unit, and reconnect the wiring; no specialized tools are usually required.

• Requires basic hand tools commonly found in marine tool kits.
• Threaded mounting for a direct, sealed fit when tightened correctly.
• Electrical connector designed to mate with factory harnesses for simple reattachment.
• Refer to the service manual for torque values and location-specific steps.

What performance and durability features does this sender offer?

Quicksilver builds the 806490T to Mercury Marine standards, focusing on measurement accuracy and resistance to saltwater and vibration. The unit’s materials and design help maintain reliable readings throughout typical marine operating conditions.

• Manufactured to meet Mercury Marine OEM specifications for consistent performance.
• Materials selected for corrosion resistance in marine environments.
• Engineered for stable readings under vibration and temperature cycling.
• Backed by Quicksilver’s decades-long reputation in marine parts and accessories.

What should I check before buying or replacing my sender?

Confirm the part number compatibility and inspect wiring and gauge condition before replacement. In many cases, symptoms attributed to the sender—such as fluctuating or no gauge reading—can also stem from harness issues or a faulty gauge, so troubleshooting both ends is advised.

• Match the 806490T number with your parts diagram or owner's manual.
• Inspect wiring connectors for corrosion, breaks, or loose pins.
• Test the gauge or instrument cluster if available to isolate faults.
• Keep installation torque and sealing practices consistent with manual instructions.

Who is this for: The Quicksilver 806490T water temperature sender is intended for boat owners, marine mechanics, and service shops working on MerCruiser sterndrives and inboard engines that require a factory-spec replacement part. It’s a practical choice for anyone needing a reliable, OEM-quality sender that integrates with Mercury Marine instrumentation to help maintain accurate engine temperature monitoring and protect engine health during regular boating use.