Whats the best way to monitor for wheel spin/slip while doing a run live?, since ive noticed some tyres/cars dont make much noise when slip is happening, and wearing headphones for knock detection doesnt help hear it either!

I have an engine tacho sensor, I know I can look at both tachos to look for difference but seems to be the hard way, and you have to look at it continuously for any chance to notice it during a run or tuning.

cheers