When you actually engage the launch control, there is a warning light on the dash that says launch control active. Then you know you're ready for lift off!

 

Yeah, haven't had an issue since reading a couple of the reply's. Still trying to figure out why my G-force reading are low, especially being tuned. One guys reports 1.30 amd another 1.34. The best I've gotten after a few trys is 1.28. Weird.