Sierra 68399P Eclipse Tachometer, 3 Inch Dial, 0-7000 RPM, Outboard Alt/Coil

The Sierra 68399P is a 3 inch Eclipse series tachometer built for outboard engines, reading from 0 to 7000 RPM with a sender code of O/B ALT./COIL, meaning it is designed to pick up its signal from the outboard's alternator or coil circuit. The Eclipse line uses smart white and blue graphics on a black dial background for high-contrast, easy-to-read visibility at a glance. Its bezel is a very low profile design that follows the curve of the lens, a detail that eliminates water trapping around the gauge face, an important feature for an instrument mounted in an open helm or exposed dash environment. The lens itself is domed glass, which sheds water on contact and resists scratching over years of use in a marine environment, so the dial stays legible and free of the haze or pitting that lower-grade plastic lenses develop. Perimeter lighting is built in for strong nighttime readability without a harsh glare washing out the dial face. The dial itself is dual-scale, printed with both U.S. And metric markings along with ISO symbols where applicable, so it reads correctly regardless of the operator's preferred unit system. This tachometer is sold individually and is also offered as part of Sierra's multi-gauge instrument sets and add-on gauge kits for twin-engine outboard installations, so it can be matched with companion gauges for a consistent Eclipse-series helm layout.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 68399P
• Dial Size: 3 inches
• RPM Range: 0-7000 RPM
• Sender Code: O/B ALT./COIL
• Series: Eclipse
• Lens Material: Glass, domed, scratch-resistant
• Scale: U.S. And metric scales with ISO symbols
• Lighting: Perimeter lighting
• Item Dimensions: 4 x 6 x 8 inches
• Weight: 0.75 pounds
• UPC: 808282266936

Fitment

Designed for outboard engines using an alternator or coil pickup for the tachometer signal (Sender Code O/B ALT./COIL). This gauge is also listed as a component of Sierra's Eclipse Twin Engine Add On OB Gauge Kit alongside the 68408P gauge.

Replaces (OEM)

No OEM cross-reference numbers are specified for this part.

Frequently Asked Questions

What is the RPM range on the Sierra 68399P tachometer? The Sierra 68399P Eclipse tachometer reads from 0 to 7000 RPM on its 3 inch dial.

Will the 68399P work with any outboard engine? The 68399P uses Sender Code O/B ALT./COIL, meaning it is built to read its signal from an outboard engine's alternator or coil circuit rather than a diesel or inboard sender type.

What size is the dial on this tachometer? The dial measures 3 inches, matching the compact Eclipse series gauge family from Sierra.

Is the lens on the 68399P glass or plastic? It is domed glass, chosen because it sheds water and resists scratching better than a flat plastic lens over long-term marine exposure.

Does the Sierra 68399P have backlighting for night use? Yes, the 68399P Eclipse tachometer has perimeter lighting built into the bezel for readability at night.

What does the Eclipse bezel design do differently from a standard gauge bezel? The Eclipse series bezel on the 68399P is a very low profile design that follows the curve of the lens, which eliminates water trapping around the gauge face.

Does the tachometer show metric readings as well as U.S. Units? The 68399P dial is printed with both U.S. And metric scales along with ISO symbols where applicable, so it can be read either way.

What are the shipping dimensions and weight of the 68399P? The Sierra 68399P ships at 4 x 6 x 8 inches and weighs 0.75 pounds.

Is the 68399P sold as part of a gauge kit? The 68399P is listed as a component of Sierra's Eclipse Twin Engine Add On OB Gauge Kit, which pairs it with the 68408P gauge, though it is also available on its own.

What color scheme does the Eclipse tachometer use? The 68399P has white and blue graphics on a black dial background, part of the Eclipse series look shared across Sierra's Eclipse gauge line.