Larry,
That's the way EZ Electric did the prototype. They mounted the VSS at the speedometer end of the cable (under the dash), then used a cable a few inches long to connect the VSS to the speedometer. I'm sure you could order it that way. They told me they could also supply a GPS VSS.
I already had a VSS, since I'd converted my OEM speedometer to electric operation years ago. The VSS I had was made by Veglia for a bunch of different '80's Italian cars (Ferrari, Alfa 164, etc.) including the Pantera Si. That's it in the photo below. I sent it to EZ Electric so they could calibrate their EPAS electronics to work with it. I then used an Autometer GPS unit to drive my speedometer.
Speaking of electric speedometers, SpeedHut has an interesting new product for converting mechanical speedometers to GPS operation. It's a GPS/VSS box that drives a short speedometer cable that screws into your mechanical speedometer.
http://www.speedhut.com/ecomme...rive-Speed-Converter
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