Hey everyone, I'm new to the Subaru wrx turbo gauge. I have an 02 manual wrx and it has the steering column mounted gauge. Anyways I'm just confused how it can read negative pressures? Half the gauge is in negative then the other half is in positive. When I'm drivin around easy it usually reads under 0 in the negative. I also understand that it reads in mPa and not psi. I have a dodge cummins turbo diesel and I know that turbo only reads in positive.. What gives?