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I found this free app for my iPhone. I used it last night driving my '60 F100. You can reverse the app and rest your phone on the dash so the speed reflects into the window.
Discovered my speedometer was roughly 5 mph at 60 mph.
Apps like these are great for our old trucks. Now we just need one to monitor fuel consumption and other things
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.