Hello, i am trying to find some info, I have a 2009 1500 5.3 6l80e in my K5 blazer, everything has worked fine for years, i recently sought out to install a high idle switch so i could ramp up motor for my York air compressor, and to charge faster in winching scenarios. Ive been told that i need the OS from a 3/4 ton or 1 ton truck because they have the PTO high idle option from factory. Does anyone know what OS this is? i have a e38 ecu so it has to be compatible with that. thanks