I bought a GPS based unit on Amazon, mounted the antenna on the dash, and wired to the main switch. IT has several functions, but the main one I wanted was the odometer and a trip meter, and of course it has speed. This unit can also display turn signals, engine alarm and 1 or 2 other lights, none of which I connected. I think this has disappeared off my Amazon list, but I will check as soon as I get a chance.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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