Vac routing. you can even see the direction of the white check valve

 

thanks for the info. i;ll check it all over again.. my white vavle is going the way in the picture above.. but i mounted my sensor just about the tank that the lines run in to just under the old factory air box location, were did every one put theres.. maybe i have it turned wrong and ever onece in a while it reads wrong and throws a light. either way it has to be simple since it didn;t do this till the intake