Mercury – Voltmeter 8–18V | Electrical System Monitoring | Black Face | Brushed Bezel | 79-8M6020045

Overview
This 8–18V voltmeter gives you a straightforward look at your boat’s electrical health without bouncing around every time the hull moves. The needle settles into a smooth, steady sweep, which makes it easy to spot when the battery or charging system isn’t acting the way it should. Out on the water, it becomes something you check almost without thinking—just a quick glance to be sure everything’s holding steady. It’s a simple gauge that makes the day feel a little more predictable.

Key Features
    • 8–18V Scale – Shows battery and charging voltage across the full operating range.
    • Calm Needle Movement – Holds a steady reading through chop and throttle changes.
    • Standard Dash Fit – Installs cleanly in common panel openings.
    • Backlit Face – Easy to read when the light starts to drop.
    • Marine-Ready Build – Made to handle spray, vibration, and long days on the water.

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

Performance & Practical Benefits
On the water, this gauge helps you pick up on electrical issues before they turn into bigger headaches. The smooth sweep makes low voltage or odd spikes easy to notice without staring at the panel. It feels natural to check while settling into cruise, idling through a marina, or firing up accessories. Over time, it becomes one of those quiet checks that keeps the day running smoothly.

Why Buy OEM
OEM gauges follow Mercury’s electrical signals closely, which keeps the readings straight. They hold up better to heat, vibration, and weather than bargain replacements. Most boaters stick with OEM because it keeps the system honest season after season.

FAQ
1. How do I know if the voltmeter’s starting to fail?
If the needle hangs up, barely moves, or jumps around for no reason, it’s likely on its way out.

2. Does this gauge need calibration?
Most setups read correctly once wired, but checking grounds and connections during install is a smart step.

3. How does it hold up in saltwater?
A quick rinse after each trip helps it last through full saltwater seasons.

4. Anything important during installation?
Good grounding and clean power wiring help the needle stay steady and accurate.

5. What does low voltage usually look like underway?
You’ll see the needle dip toward the lower end and stay there, often before other symptoms show up.