MGI SpeedWare Digital Voltmeter Ammeter 2-in-1 (Blue) — 12V LED Voltage & 10A Current, 1-1/8" Panel

The MGI SpeedWare 2-in-1 Digital Voltmeter Ammeter is a compact LED gauge that shows real-time 12V DC voltage and current (up to 10A) in one easy-to-read display.

If you need a simple, low-profile instrument to monitor the electrical condition of cars, trucks, boats, RVs and other 12V systems, this MGI SpeedWare meter puts voltage and amperage side-by-side so you can spot problems or confirm power draw at a glance. It fits into a 1-1/8" round dash hole, uses a bright blue LED readout, and installs with straightforward battery, ground and load connections. Note: it monitors DC voltage and current but does not measure battery charging current.

How does the combined voltmeter and ammeter help me monitor my vehicle's electrical system?

The dual-display keeps both voltage and current visible simultaneously so you can verify supply voltage and track load draw without switching instruments. That makes it quicker to catch low-voltage conditions, unexpected drains, or high current usage from accessories.

• Real-time LED readouts for voltage and amperage on one gauge
• Voltage monitoring for 12V (and compatible with 24V systems per specs)
• Current readout up to a 10 amp maximum for accessory loads
• Compact face fits a standard 1-1/8" round panel hole

How easy is it to install and wire the MGI SpeedWare meter?

Installation is designed to be straightforward: cut or use a 1-1/8" mounting hole, secure the gauge into the panel, and make three basic connections — battery positive, ground, and the load lead. The meter requires no complex programming and the wiring is suitable for custom vehicles and aftermarket accessories.

• Mounts into a 1-1/8" round hole for dash or panel use
• Three-wire hookup: battery +, ground, and load connection
• No software or calibration needed after physical installation
• Included unit only — wiring supplies and fuses to be supplied by installer

What are the display and measurement limits I should expect?

The bright blue LED display provides clear numeric values for both voltage and current, optimized for 12V systems. Current measurement is limited to a maximum of 10 amps, so it’s best suited to smaller accessory circuits rather than high-amperage starters or alternator outputs.

• Clear blue LED readout for quick visibility day or night
• Voltage: designed for 12V DC systems (works with many 24V systems as noted)
• Current: measures up to 10 amps (not for heavy-duty high-amperage use)
• Not intended to measure battery charging current from alternators

Will this gauge work in marine or off-road environments?

The meter is built for a variety of vehicles including boats, RVs, ATVs and custom builds where monitoring 12V loads is useful. While it suits many mobile and marine applications, ensure wiring is protected and fused appropriately for exposure to vibration and moisture.

• Commonly used in cars, trucks, boats, RVs, ATVs and motorcycles
• Compact, vibration-tolerant design for dash or console mounting
• Install with proper marine-grade wiring and fusing where required
• Not a replacement for specialized marine battery monitoring systems

Who is this for: The MGI SpeedWare 2-in-1 digital voltmeter ammeter is ideal for DIY mechanics, custom vehicle builders, boat owners, and RV or motorcycle enthusiasts who want a reliable, compact gauge to monitor electrical health and accessory draw. Choose this unit if you need a simple, economical panel instrument to check system voltage and up to 10A of current in installations where a combined, easy-to-read display is valuable.