Classic Speed® Speedometer GPS Sending Unit

If you want to keep your original dash gauges and want to upgrade your drive-train making the speedometer work has been a hassle until now. With the Classic Speed® your older mechanical speedo will read correctly with any type of transmission including newer ones with an electronic pulse speed sensor. The Classic Speed® unit reads your vehicles speed via a GPS signal and never needs to be re-calibrated if you change gear ratio or tire size.

U.S. Patent No. 9,802,487 entitled ‘Speedometer Drive System And Method’

Classic Speed® is an electro-mechanical device that drives a classic car's mechanical speedometer to ensure accurate speed. It is quick and easy to implement, non-vehicle dependent, and less disruptive than any other solution out there. Everyday use of Classic Speed is transparent and seamless to the original driving experience.

You simply unscrew your speedometer cable from the transmission and screw it onto the front of the Classic Speed unit. Do a quick, simple calibration with the provided dongle to set up your own speedometer, and you’re off! And since the mechanical speedometer is connected directly to Classic Speed, your speed reading becomes ‘car independent’ - your speed will always be accurate, regardless of any modifications you make to the car.

Click For Installation Instruction Sheet

Classic Speed replaces the original method of driving the speedometer by utilizing GPS for deriving ground speed, translating, and delivering the information via the speedometer cable to the speedometer.

PART NUMBER: DAS-534

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Problem statement:
The speedometers of pre-1985 automobiles are driven mechanically by a cable connected to the vehicles’ transmission. Elements such as varying tire diameter, drive system gear ratios, and aging mechanical systems can severely alter the accuracy of both the speedometer and odometer. This can result in expensive and unnecessary speeding violations, along with a reduced vehicle value due to a higher than actual odometer reading.

Solution:
Classic Speed replaces the original method of driving the speedometer by utilizing GPS for deriving ground speed, translating, and delivering the information via the speedometer cable to the speedometer.

Tracking up to 22 satellites on 66 channels, there's a small, active antenna that sits anywhere there is line of sight to the sky. It uses that signal to calculate ground speed, and then uses the internal software of the program to change that ground speed into a signal to drive an electric motor in the Classic Speed unit.

Classic Speed takes the place of the transmission to drive your speedometer. You simply unscrew your speedometer cable from the transmission and screw it onto the front of the Classic Speed unit. Do a quick, simple calibration with the provided dongle to set up your own speedometer, and you’re off! And since the mechanical speedometer is connected directly to Classic Speed, your speed reading becomes ‘car independent’ - your speed will always be accurate, regardless of any modifications you make to the car.

As for places where you can’t locate a satellite, e.g. tunnels, there’s no need to worry. Classic Speed works to accommodate! If satellite triangulation is lost, we have an algorithm to continue to drive the speedometer based on an average speed of the last few minutes. This is more to keep the inertia of the system going than to let you know how fast you're going. Exit the tunnel, reconnect, and you are back in business!