Hardline Marine Hour Meter

From the Amazon Listing

• COMPLETE ENGINE MONITORING: Automatically switches between a Tachometer (RPM) while the engine is running and an Hour Meter when off. Displays RPM up to 16,000 with variable refresh rates, allowing you to tune carburetors, adjust idle speeds, and track runtime for precise oil changes and valve adjustments.
• UNIVERSAL INDUCTIVE COMPATIBILITY: Works on any gasoline engine up to 2 cylinders (2-stroke or 4-stroke), including modern pencil-coil ignitions. The patented one-wire inductive pickup simply wraps around your spark plug wire—no cutting, splicing, or hard-wiring into your electrical system is required.
• EXTREME DURABILITY & WATERPROOF: Built for the harshest environments, this unit is 100% epoxy-encapsulated with an IP-68 rating. It is fully waterproof, dustproof, and vibration-resistant, making it perfect for pressure washing off-road vehicles or surviving marine saltwater environments.
• ZERO-MAINTENANCE BATTERY: Features a sealed internal lithium battery with a 10-year lifespan. It draws zero amperage from your vehicle's battery, ensuring it will never drain your starting power, even during long-term storage.
• EASY INSTALL: Designed, engineered, and assembled in the United States. Installs in seconds using the included industrial-strength peel-and-stick mounting tape. Includes a dedicated Maintenance Log Book to help you record service intervals.
• Customizable Ignition Settings: Select from 3 firing patterns—1P/1R (1 Pulse per 1 Revolution), 2P/1R (2 Pulses per 1 Revolution), or 1P/2R (1 Pulse per 2 Revolutions)—to calibrate the tachometer to your exact 2-stroke or 4-stroke engine configuration. Pro Setup Tip: Not sure if your 4-stroke uses a traditional or "wasted spark" ignition? Start on 1P/1R and check your idle RPM. Typical powersports and utility engines idle between 1,200 and 1,800 RPM. If your meter reads ~750 RPM at idle (half speed) or ~3,000+ RPM (double speed), simply toggle the input setting until the idle matches normal operating range.