Sierra 68401P Eclipse 2 Inch Water Temperature Gauge, 120-240 F, IB/IO

The Sierra 68401P is a 2 inch Eclipse-series water temperature gauge built for most outboards, stern drives, and gasoline-powered inboards. It reads a temperature range of 120 to 240 degrees F and pairs with a sender using code "D". The Eclipse design features smart white and blue graphics on a black dial background, with a very low profile bezel that follows the curve of the lens to eliminate water trapping around the edge of the gauge. The lens itself is domed glass, which sheds water and resists scratching over years of use in a marine helm environment.

Nighttime visibility is handled by perimeter lighting built into the bezel, so the dial stays readable after dark without glare washing out the face. The dial is marked with both U.S. And metric scales, and ISO symbols are used where appropriate, making the gauge easy to read regardless of which measurement system the operator prefers. The 1/8 NPT thread type on the sender connection matches standard marine temperature sender fittings. For boat builders and refit projects looking for a matched helm, the 68401P is also offered as part of a larger IB/IO instrument set alongside matching tachometer, hour meter, and other Eclipse gauges. Optional add-on eyebrow or square bezels are available separately for owners who want a different bezel profile.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 68401P
• Product Type: Water Temperature Gauge
• Series: Eclipse
• Dial Size: 2 inches
• Temperature Range: 120 to 240 degrees F
• Sender Code: D
• Thread Type: 1/8 NPT
• Material: Glass
• Item Dimensions: 2 x 3 x 4 inches
• Weight: 0.5 pounds
• Lens: Scratch-resistant domed glass
• Lighting: Perimeter lighting
• Scale: U.S. And metric with ISO symbols
• Compatible Applications: Most outboards, stern drives, and gasoline-powered inboards
• UPC: 808282267131

Fitment

• Fits most outboards, stern drives, and gasoline-powered inboards
• Requires a temperature sender using sender code "D"

Frequently Asked Questions

What temperature range does the Sierra 68401P water temperature gauge read? The gauge reads a range of 120 to 240 degrees F, displayed on a 2 inch dial with both U.S. And metric scales.

Does the 68401P come with a temperature sender? The 68401P gauge itself requires a sender using sender code "D" for correct operation; the sender is matched by that code rather than bundled as a fixed kit item in this listing.

What boats and engines is the Sierra 68401P designed for? It is designed for most outboards, stern drives, and gasoline-powered inboards, making it a broadly compatible helm gauge rather than a single-engine-specific part.

What size is the dial on this gauge? The Sierra 68401P has a 2 inch dial, part of the Eclipse instrument line.

What is the lens made of on the Eclipse gauges? The 68401P uses a scratch-resistant domed glass lens that sheds water and resists scratching over time.

Does the 68401P light up at night? Yes, perimeter lighting is built into the bezel for good readability after dark.

What thread size does the sender connection use? The 68401P uses a 1/8 NPT thread type for the sender connection.

How much does the Sierra 68401P weigh? The gauge weighs 0.5 pounds.

Can the 68401P be paired with matching gauges for a full instrument panel? Yes, the 68401P is offered as part of a larger IB/IO instrument set with matching Eclipse-series tachometer, hour meter, and other gauges for a coordinated helm layout.

Are additional bezel styles available for the 68401P? Yes, optional add-on eyebrow or square bezels are available separately for the Eclipse gauge line.

Why does the bezel design matter on the Eclipse 68401P? The very low profile bezel follows the curve of the lens, which eliminates water trapping around the edge of the 68401P gauge.

What does the dial look like on the 68401P? It has smart white and blue graphics on a black dial background, part of the Eclipse styling used across the 68401P and matching instruments.