[Paulekas]

Hi guys i have older version system from 2010 and trying to figure it out how to use it basically when i try to adjust SC buttom clockwise or counterclock wise on ignition on flow gauge display doesnt light up but i know it changes when i drive and boost kicks in is there special screwdriver i have to use or gauge is messed up? Also would like to perform manual spray test to see how it sprays can you pls tell me how to simply do that thx so much