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, 20w50 is OK in high mileage cars).
If the oil pressure is still very low, you should plan on an engine rebuild.
how to remove oil pump for 99 vw passat.
It does.
Begin by training the oil from your 1990 VW oil pan. Remove the oil pan retaining bolts. Remove the oil pump retaining bolts. Reverse the process to install your new oil pump.
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Oil pump failure
Oil pump change
it should be by the oil filter, which is in front of the block
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about 20USD for the gear oil and 8USD for a pump. you'll need a 17mm Allen wrench and jackstands.
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steps by steps how to change a oil pump