Mercury MerCruiser Quicksilver Temperature Sensor Assembly 805218T
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Mercury MerCruiser / Quicksilver Temperature Sensor Assembly – 805218T
Monitor engine temperature accurately with the genuine Mercury Marine / Quicksilver 805218T Temperature Sensor Assembly. This OEM engine coolant temperature gauge sender measures coolant temperature and transmits the signal to the dashboard gauge, allowing operators to monitor engine heat and prevent overheating.
Built to Mercury Marine’s original equipment specifications, this sensor provides reliable and accurate temperature readings for MerCruiser sterndrive and inboard engines equipped with EFI systems.
Key Features
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Genuine Mercury / Quicksilver OEM temperature sensor assembly
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Sends engine coolant temperature data to the dashboard gauge
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Helps detect overheating conditions early
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Durable marine-grade construction resistant to corrosion and vibration
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Direct replacement for the factory-installed temperature sender
Part Details
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OEM Part Number: 805218T
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Product Type: Engine coolant temperature gauge sender
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UPC: 745061278196
Compatible Mercury MerCruiser Engines
Commonly used on MerCruiser sterndrive and inboard engines, including:
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MCM (MerCruiser Sterndrive) EFI engines
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MIE (MerCruiser Inboard) EFI engines
Exact applications vary depending on engine model and serial number range.
Function
The temperature sender is installed in the engine’s cooling system and sends an electrical signal to the helm gauge indicating coolant temperature. Accurate readings help operators detect cooling issues early and avoid serious engine damage caused by overheating.
Important Compatibility Note
Temperature senders may vary by engine model, gauge type, and serial number range. Always verify compatibility using the engine serial number before ordering to ensure the correct replacement sensor.
Shipping: Ships same or next day for fast Canada wide shipping.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.