I have done a 411 PCM swat to my 96 gmc, installed e-fans with two speed control. I want the fans to come on high when my a/c is on because my high side pressure is about 250psi. I have done everything I can but get no response. I wired 5volts to the a/c pressure sensor circuit and changed G0918 to 1kpa and G0919 to 0kpa. I am thinking the PCM does not support this option.