This is where you set the scale for the speedometer. I got quite variable results with the “gathering” technique and found it easier to just test/adjust/test/adjust till the speeds matched my Tomtom.
I haven’t delved into how this plays out on the gen1 yet, and have no idea how it works with gen2 currently but on gen3 you can click “Skip gathering, I know what to set” and set it to 150 and you should be about right (on stock tyres)*.
*For gen3 this should already be set for you when I set up your ECU up before posting it.
