Not only does every data recording system we make allow you to start recording on RPM, but they also can Stop on RPM and allow for ARMING on POWER UP. THese features allow our DataQuest, RedAlert and O2alert systems to record without any interaction required from the driver or crew. Being a racer myself I determined a long time ago that the last thing I want to have to worry about is having to remember to turn something on or off before I make a run, therefore I designed my systems to be completely automatic. All I have to do is turn my kill switch on (battery power on) and everything runs automatically.