Mercury – Voltmeter 8–18V | Electrical System Monitoring | White Face | Chrome Bezel | 79-8M6020021

Overview
This 8–18V voltmeter gives you a clean, steady look at your electrical system without bouncing around when the boat rocks or hits a little chop. The needle settles smoothly, so dips or spikes stand out right away. Out on the water, it becomes one of those quick checks you make without thinking—glance, confirm, and keep going. It’s a simple, reliable gauge that helps you stay ahead of electrical hiccups.

Key Features
    • 8–18V Scale – Shows charging and battery voltage across the normal range.
    • Smooth Needle Sweep – Holds steady through chop, turns, and throttle changes.
    • Standard Dash Fit – Sits neatly in common dash cutouts.
    • Backlit Display – Easy to read when the light drops.
    • Marine-Durable Build – Handles spray, vibration, and everyday conditions.

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

Performance & Practical Benefits
On the water, the gauge makes it easy to catch low voltage or odd charging behavior before it causes real trouble. Because the sweep stays calm, changes show up clearly without distracting you. It’s useful during long runs, while dockside, or anytime you’re running lights, pumps, or electronics. It quickly becomes a part of your normal routine.

Why Buy OEM
OEM gauges read Mercury’s electrical signals exactly the way they’re meant to, so the number you see is accurate. They hold up better to vibration, heat, and weather compared to cheaper replacements. Most boaters choose OEM because it keeps the electrical system honest.

FAQ
1. How do I know if the voltmeter is failing?
If the needle sticks, barely moves, or jumps for no reason, the gauge is probably wearing out.

2. Does this gauge need calibration?
Most rigs read correctly right away, but checking wiring and grounds during install is smart.

3. How does it handle saltwater?
A quick rinse after each run helps it hold up well in saltwater conditions.

4. Anything important during installation?
Clean, tight power and ground connections keep the reading steady.

5. What does low voltage usually look like underway?
The needle drops toward the lower end and doesn’t recover under load.