I checked it. I can't speak for all trims, but the Big Horn does not show top speed by holding the select button like the Charger did. On the Ram it may only be a GT option with the performance page.As for checking the top speed. You can typically check this on the navigation menus, but based on the photo, it looks like the GT has a display on the EVIC. I haven't tried it on the Ram to see if they all do it, but my Charger would display by holding the "select" button for 3 seconds while on the digital speedometer.