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The replacement screen/digitizer sold by iFixit lacks the fingerprint sensor. You will need to carefully pry the sensor from the defective screen and reattach it to the replacement screen.
Stripped a head on my left screw (A1181 model, Core 2 Duo 2.0 GHz). Used a precision 1.5 slotted screwdriver to get enough bite to screw it out and back in.