[tatkins85]

ok guys i just installed new turbo,head studs, stg3 cp3, injectors, exhaust manifold,mp8, bully tog tripple dog, and a fass system. my check engine light is not on but when i check codes anyways it says pc121 ? and my speedo dosnt work the abs and brake lights are perminetly on my 4 wheel drive wont engage and my tow mode and overdrive button dont work and i cant see my P R N D 1 2 gears on the dash there not lit up? dos anyone have any ideas on what could cause this?? please help me.