on the right side,,theres the "boost controller",which i pretty much leave closed off most of the time ,,wheni do that,,the little needle on the boost guage(middle,top) goes between the 30,and 0,,,soi dunno how much that is,,looks like 35 or so??actually the one in the center console,lower middle,is from atruck,and it goes to 45,,its not hooked up though,yet,guess i could put one after ic,one before,,