Actually copper usually goes on the drain plug and aluminium goes on the oil filter housing. Oil pressure should register within ten secs. If you are worried disconnect the ingnition coil and run the engine with the starter, again it should only take about 10 secs at most to register engine oil pressure.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)