GPS Speedo

Pound said
Anyone out there put a gps speedo in their car? I'm considering this as an option since ALL FOUR of my original speedometers I saved up have issues. The car in question is a '74 Swinger. I was thinking of putting an aftermarket tach & speedo in place of the original speedo, so why not gps? Also would like to know if there is a fee or subscription to use these.
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I have one in my Barracuda. Seems to work pretty good and there is no subscription or anything like that. Uses the same signal your Garmin or TomTom use. In fact, if you have a dash mounted GPS, you'll notice that they display your current speed as well. I don't know how effective they'll be in areas with poor satellite coverage though.