Sierra 57904P Amega 2 Inch Water Temperature Gauge, 120-240 F, I/O-IB

The Sierra 57904P is a 2 inch Amega-series water temperature gauge built for I/O and inboard marine engines, reading across a 120 to 240 degree Fahrenheit range. Part of the Amega black-dial instrument line that has been in production since 1986, this gauge pairs a black dial face with red graduations, white numerals, and a vivid white pointer staff for clear at-a-glance readability from the helm, day or night, thanks to through-dial and perimeter lighting.

The face is protected by a scratch resistant curved glass lens set into a black, near-flush bezel with an outer diameter of 2.39 inches, giving it a low-profile, integrated look on the dash. The dial carries both U.S. And metric scales with ISO symbols where applicable, so it reads correctly regardless of which measurement standard the rest of the helm uses. Electrically, the gauge draws 0.10 to 0.15 amps and requires a sender with Sierra sender code "D" to display accurate readings; it uses NPT thread styling at the sender connection.

This gauge is designed to work as a standalone instrument or as part of a matched Amega instrument set alongside the tachometer/hour meter and other companion gauges, so multiple gauges on the same dash share a consistent black-dial look.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 57904P
• Product Type: Water Temperature Gauge (Amega, 2 inch, I/O-IB)
• Dial Range: 120 to 240 degrees Fahrenheit
• Dial Size: 2 inches
• Bezel Outer Diameter: 2.39 inches
• Dial Color: Black
• Graduations: Red
• Numerals: White
• Pointer: White pointer staff
• Lens: Scratch resistant curved glass
• Bezel Finish: Black, near-flush
• Scale Markings: U.S. And metric scales with ISO symbols where appropriate
• Current Draw: 0.10 to 0.15 amps
• Sender Code Required: D
• Thread Style: NPT
• Weight: 0.3 pounds

Frequently Asked Questions

What temperature range does the Sierra 57904P gauge read? The Sierra 57904P Amega water temperature gauge reads from 120 to 240 degrees Fahrenheit across its 2 inch dial.

What sender does the 57904P need to work correctly? This gauge requires a sender with Sierra sender code "D" for accurate temperature readings; using a different sender code will throw off the reading.

How much current does the 57904P water temperature gauge draw? Current draw for the Sierra 57904P is 0.10 to 0.15 amps, which should be accounted for when sizing the gauge circuit or fuse.

What size is the dial and bezel on this gauge? The 57904P has a 2 inch dial face with a bezel outer diameter of 2.39 inches, sized for a standard 2 inch instrument panel cutout.

Is the 57904P part of a matched instrument set? Yes, the Sierra 57904P Amega water temperature gauge is designed to pair with other Amega instruments such as the tachometer/hour meter so a full dash shares the same black-dial styling.

What color scheme does the Amega 57904P gauge use? It has a black dial with red graduations, white numerals, and a white pointer staff, part of Sierra's Amega black-dial line introduced in 1986.

Does the 57904P lens resist scratching? The 57904P uses a scratch resistant curved glass lens set in a black, near-flush bezel for durability and a clean look on the dash.

Does the gauge show both Fahrenheit and metric readings? The Sierra 57904P dial includes both U.S. And metric scales with ISO symbols where appropriate, so it works with either measurement convention.

What thread style does the 57904P sender connection use? The 57904P uses NPT thread styling at the sender connection.

How much does the Sierra 57904P weigh? The Sierra 57904P Amega water temperature gauge weighs 0.3 pounds.

Is the 57904P suitable for I/O and inboard engines? Yes, the Sierra 57904P is built as a water temperature gauge for I/O and inboard (I/O-IB) applications.