I just bought a GPS enabled unit that was under $60 from amazon, has speed, trip miles, odometer, and then can also be connected to 3 or 4 alarms (oil, high beams, etc) as well as turn signals. I was able to mount in the dash, and as noted above this was primarily for the odometer function.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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