What George Said,
Fully charged battery.
Prime the oil pump.
Try these tips or search for more.
PorscheDoc is a pro mechanic:
priming oil pump - Rennlist Discussion Forums
Remove the DME/Fuel pump relay when you check for oil pressure. Prevents fuel from washing cylinder walls and ending up in crankcase.
RECHECK all top of engine electrical connections--like the AFM main cable. Put back DME/FUEL pump relay.
GOOD LUCK!
J_AZ