The pump is in the oil pan. You will need a book in order to time the engine when you are done. The new oil pump will probably not fix your oil pressure problem. Try thick oil (5w30 is way too thin,...
In the oil pan. Low oil pressure almost always requires an engine rebuild to fix. Try a thicker oil. VW's and diesels use 15w-40 or 20w-50. Quick lube shops put 5w30 in everything, and it will wreck...