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I have a custom vehicle that uses 1972 1600cc VW parts and has the cable driven speedometer in MPH. I was curious if there is a reliable product that I can use to convert from anolog to digital to allow for smaller gauges/custom clusters.

  • You want us to research a suitable product? – Solar Mike Mar 18 at 7:17
  • Not research, but information on a unit that someone may have had installed in a professional environment. There's one I found that might work but holds no engineering testing certification so it makes me cautious to use it. – SGZLS Mar 18 at 14:29
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Electronic speedometers typically pickup a signal from an electromagnetic pickup which takes a signal from a magnet attached to the output of the final drive. It is possible to adapt certain gearboxes which provide a cable drive to use this type of pickup such as this or you could fit ABS rings and take a feed from the wheel speed sensor. Effectively, all you need is an electrical "pulse" and a speedometer capable of being calibrated to this signal.

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One solution is to use a GPS Speedometer. Google it and you will find lots of options.

  • Check if a GPS speedometer is road legal in your country. (The UK legal situation is a bit silly - they are illegal since they don't work in all situations (e.g. in tunnels) but the speedo is not checked as part of the annual MOT vehicle test!) – alephzero Mar 18 at 9:35
  • GPS is not ideal, I currently use my GPS as a speedometer beside the anolog one to make sure my speed is accurate. Too many red light/speed traps where I'm from to loose signal and try to match crowd speed. – SGZLS Mar 18 at 14:34

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