4" GPS Speedometer | 120 MPH | Datsun 510 Design

SKU: R4-S1-510
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$386.22 USD
Real-time, calibration-free speed using GPS satellite data. No speed sensors, gear ratios, or tire size input required—just connect 12V power, mount the antenna, and drive. Built for manual, automatic, and custom setups, with a precision stepper motor for smooth, stable readings.
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Order leaves our facility in about 2 Weeks

The GPS Speedometer delivers accurate, real-time speed using satellite data—no calibration, no sensors, and no transmission connection required. It works with any setup, from stock drivetrains to full custom builds, making installation simple and reliable across a wide range of vehicles. A precision stepper motor keeps the needle smooth and steady, giving you clear, dependable readings at a glance. Built with a durable housing and solid aluminum bezel, it’s designed for real driving conditions and long-term use. Made in the USA and backed for life.

Track-Tested. USA-Built. Backed for Life.

Key Features:

  • Calibration-Free GPS — no sensors, gear ratios, or tire inputs required
  • Worldwide Coverage — free GPS signal with no subscriptions
  • Simple Installation — connect power, mount antenna, and drive
  • Universal Compatibility — works with manual, automatic, and custom setups
  • Microprocessor-Driven — real-time accuracy
  • Stepper Motor Precision — smooth, accurate pointer movement
  • Weather-Resistant Build — built for street, track, and off-road
  • Made in the USA — backed by a lifetime warranty
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Built to last. Backed for life.
  • Lifetime warranty on internal circuit board electronics
  • 5-year coverage on sensors and wiring
  • Applies to gauges purchased since Jan. 1, 2006

Every Speedhut gauge includes a lifetime warranty* on the electronic circuit board inside the gauge case. It is the core of the gauge — the part responsible for the precision communication that delivers the accuracy and performance Speedhut is known for.

Sensors, wiring, and other external components are covered by an unlimited 5-year warranty.

This combined lifetime / 5-year warranty applies to the original purchaser.
*For your lifetime — as long as you own the gauge — we stand behind it.
Speedhut Inc warrants products to be free from defects in materials or workmanship. This warranty is limited to repair or replacement. Speedhut Inc is not responsible for incidental or consequential damages. Improper use, installation, or unauthorized modifications void this warranty.

They are incredibly simple and straightforward to install! Our GPS Speedometers connect to the Global Positioning System through an antenna, and don't require a transmission sensor. (The antennas are included with the GPS Speedometers, too!) This makes them very easy to install in vehicles that lack electronic sensor output.

The GPS speedometer updates 4 to 5 times per second. The update rate is fast enough to not show any noticeable delay in keeping up with speed under hard acceleration or braking. Our GPS speedometer are used without issues in many performance cars!

If you exceed your speedometer's maximum speed, the pointer will remain at the maximum speed position, and will not move below the maximum speed position until your speed drops back into a readable range.

Luckily for all of the speed-fiends out there, this will NOT damage the speedometer.

If the speed exceeds the analog range and you are using a GPS speedometer with an LCD display then you can use the digital speed display feature to view your current speed.

Our GPS speedometers rarely drop signal. They use a powerful 'active' antenna which perform exceptionally well in all driving environments, including tall buildings, canyons, and extreme weather such as rain and snow. In most cases, the only time you will experience a signal loss is while driving in tunnels or in parking garages.

No, but we offer three different antenna lengths for you to choose from: 5', 9.8' and 15'.

The best location for the GPS antenna to be mounted is on the roof of the vehicle. The GPS antenna is waterproof and magnetic. If the roof is inaccessible, the antenna can be mounted on the top of the dashboard in a place with maximum exposure to the sky.

Metal will block the GPS signal, but the GPS antenna can receive a signal through thin materials like wood, glass, fiberglass, and plastic.

Yes, we can do that for you!

Please tell us your mileage in the 'Order Comments', and we will program your odometer when we build your gauge.

If you already own one of these speedometers you can send it back to us and we can program the miles into the odometer (shipping charges will apply).

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