I went online and found a heads-up speedometer display WITH adjustable speed limit warning. This uses GPS, can be moved between vehicles, and needs just a cigarette lighter to plugin the power supply. installation 5 minutes, and cost less then $100. I think this is much better than any of the local suppliers as none of them had the speed limit alarm.
I found this at Overstock.com but a google search showed several available. I even found one that doubled as a rearview mirror, but since the cart already had a mirror I went with the heads-ups unit.
Hope this helps, just my thoughts.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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