When at WOT the lean switch will then start to monitor the AFR and if it goes lean during the run it will shut your nitrous down. simple to install and setup. •+12V output and a ground output when the nitrous is active.
DynoTune Nitrous Lean Shutdown Switch - Air/Fuel Safety Controller 0-5V
NITROUS LEAN SWITCH WIDE BAND AFR SHUTDOWN CONTROLLER NITROUS switch air fuel
BOSS Industries 301578, Piston Temperature Shutdown Switch
15789 Nitrous Express Custom Switch Panel, Silverado/Sierra 2014-2018