Chevrolet Trailblazer Timing Chain Replace/Remove

Tell Me How To Set The Marks When Replacing The Timing Chain On Vehicle Listed Above With A 1.3 Liter Turbo I-3 L3t Engine.

I Changed The Timing Chain And Now The Oil Pump Won't Engage

:? I Have Replaced All Of The Sensors, New Timing Chain, New Plugs, Wires, Dist. Cap, Rotor, 160,000 Mi.; It Is Ideling Rough, Sometimes...