That's cool you can blur out the speedos so fast. If I'm lazy I can blur out the speedo pretty fast if I make the blur box or censor box really really big so when my helmet moves around it's still blurring out the speedo even if I don't motion track. If I want to make the blurry box nice and clean that takes a while.I blur my speedometer whenever my speed accidentally breaks the "10 over" point, just in case. Between the GoPro fisheye lens and alternate camera views, I don't worry much.
At this point, it only takes a little bit of time to do the blur, so I blur it out. If anyone's using Davinci Resolve and wants a tutorial on it, I did a blur & track video on my channel recently.