Sierra 65509P Lido Water Temperature Gauge, 2 Inch, 120-240 Degrees F, I/O and I/B

The Sierra 65509P Lido Water Temperature Gauge is a 2 inch dial gauge designed to monitor engine coolant temperature on I/O (inboard/outboard) and I/B (inboard) marine engines. It displays a dial range of 120 to 240 degrees F, giving boaters a clear read on whether the engine is running within a safe operating range or trending toward overheating. The gauge face is scratch resistant, helping it stay legible in the helm environment where sun exposure, spray, and routine handling can degrade lesser gauges over time.

Construction combines alloy steel, brass, and stainless steel components, materials chosen for corrosion resistance in the marine environment. The 65509P is built to Sierra's standard for engine and drive parts, meeting or exceeding the specification of the original equipment gauge it replaces. It pairs with a sender using code D for proper calibration, so buyers should confirm their sender matches before installation. As a helm instrument, it mounts into a standard 2 inch gauge panel cutout alongside other Sierra Lido series gauges for a matched instrument cluster look.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 65509P
• Product Type: Water Temperature Gauge
• Series: Lido
• Dial Size: 2 inches
• Dial Range: 120 to 240 degrees F
• Sender Code: D
• Engine Application: I/O, I/B
• Material: Alloy Steel, Brass, Stainless Steel
• Item Dimensions: 5.1 x 3.9 x 0.8 inches
• Weight: 0.3 pounds
• UPC: 731957423382

Fitment

For I/O (inboard/outboard) and I/B (inboard) engines using a sender code D.

Frequently Asked Questions

What is the dial range on the Sierra 65509P gauge? The dial range on the Sierra 65509P water temperature gauge is 120 to 240 degrees F, covering the normal operating band for marine engine coolant temperature.

What size is this gauge? The Sierra 65509P has a 2 inch dial, sized to fit a standard 2 inch helm gauge cutout.

What engines is the 65509P compatible with? This gauge is designed for I/O (inboard/outboard) and I/B (inboard) engine applications.

Does the 65509P gauge need a specific sender? Yes, the Sierra 65509P is calibrated to work with a sender using code D; using a different sender code will give an inaccurate reading.

What is the gauge face made of? The 65509P dial face is scratch resistant, and the gauge assembly is constructed of alloy steel, brass, and stainless steel components.

Will this gauge match other gauges in a Sierra Lido panel? Yes, the 65509P is part of Sierra's Lido series of gauges, designed to match in style and dial size with other Lido instruments for a uniform helm panel.

How much does the 65509P weigh? The Sierra 65509P weighs 0.3 pounds.

What are the physical dimensions of the gauge? The 65509P measures 5.1 x 3.9 x 0.8 inches.

Is the Sierra 65509P an OEM replacement or an upgrade over the original gauge? The 65509P is built to meet or exceed the specification of the original equipment water temperature gauge it replaces.

What is included when I order the 65509P? The order includes one Sierra 65509P Lido water temperature gauge; the required sender (code D) is a separate component.