If you go to Amazon you will find many GPS enabled speedometers several which include other options like Odometer and indicators lights if you want them. These are easy to install and i will be glad to install or help you send me a PM and we can discuss over the phone and i can show you what I have. PS the GPS units do not need to be calibrated.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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