Great tool, but there's a few improvements that could be made in my mind. First one would be a bigger font size for the numbers related to resolution.
Second one is about the way colors work on the RPM gauge. This is how I would prefer it myself:
- white under 95%
- dark blue between 95 and 98%
- light blue / cyan between 98 and 99.5%
- green above 99.5%
- yellow decreasing between 99.5% and 98%
- red decreasing below 98%
- purple decreasing below 95%
Right now it pushes you to shift too early, especially for some cars with a steep rising power curve before peak but a slowly decreasing plateau past peak power.
Also, I don't know if you could add that, but having live toe would be great as well if that's something you can include. But again, very nice tool, thanks for that !