Mercury – Voltmeter 8–18V | Electrical System Monitoring | White Face | Black Bezel | 79-8M6020057

Overview
This 8–18V voltmeter gives you a straightforward look at how your electrical system is doing without bouncing around every time the boat moves. The needle settles into a calm, predictable sweep, so any dip or spike is easy to catch with a quick glance. Out on the water, it becomes a simple habit—check it, nod, and get back to running the boat. It’s the kind of gauge that keeps things honest without making a big deal out of it.

Key Features
    • 8–18V Range – Shows battery and charging voltage across the normal operating window.
    • Smooth Needle Movement – Stays steady through chop, turns, and throttle changes.
    • Standard Dash Fit – Drops right into common dash openings.
    • Backlit Face – Easy to see when the light starts to fade.
    • Marine-Durable Build – Handles spray, vibration, and long days on the water.

Engine & Boat Compatibility
    • FourStroke outboards
    • Verado series
    • Pro XS engines
    • SmartCraft systems

Performance & Practical Benefits
Out on the water, this gauge helps you pick up early signs of battery trouble or charging dips without needing to watch it closely. A steady sweep makes small changes obvious, which is helpful when you’re running lights, pumps, or other gear. It’s a quick-check gauge—easy to read, easy to trust. Over time, it just becomes part of keeping the boat running smoothly.

Why Buy OEM
OEM gauges follow Mercury’s electrical signals the way they’re supposed to, which keeps the readings stable. They hold up better to vibration, moisture, and heat than cheaper versions. Most boaters stick with OEM because it avoids the “is this reading right?” guessing game.

FAQ
1. How do I know if the voltmeter is going bad?
If the needle barely moves, jumps around, or freezes in place, the gauge is probably wearing out.

2. Does this gauge need calibration?
Usually it reads correctly from the start, but checking wiring and grounds during install is always smart.

3. How does it handle saltwater use?
A quick rinse after the day’s run helps it hold up well through saltwater seasons.

4. Anything important during installation?
Clean power and ground connections make a big difference in how steady the needle stays.

5. What does low voltage usually look like on the gauge?
The needle will drop toward the lower end and stay there, often before anything else acts up.