Install new oil pan gasket onto you oil pan-to-engine mating surface and apply gasket sealer to the top of the gasket when ready to install. with the oil pickup tube inserted through the hole in the pan, slide the copper washer and locknut on the tube outside the pan BUT DO NOT THREAD THE LOCKNUT ONTO THE TUBE YET. Now slide the threaded bushing onto the pickup tube, then slide the neoprene gasket/seal onto the end of the tube.
As you raise the pan to the bottom of the engine block, insert the end of the tube into the oil pump and screw in a few bolts to hold the pan to the engine. Now pull the elbow portion of the pickup tube outward and screw the locknut in that holds it to the pan but DO NOT TIGTHTEN YET. Push the neoprene gasket seal into the oil pump if necessary and screw in the threaded bushing to the oil pump but DO NOT TIGTHTEN YET. Screw in the rest of your pan bolts and tighten to specifications. Now go back and tighten the locknut FIRST, then tighten the bushing on the oil pump.
DONE.