If it's truly just LOW oil pressure, you would probably be fine moving it out of your garage. How does the engine look under the valve cover? Lots of sludge? I'll be honest I've never heard of oil pressure issues on an N62.
BTW, here is the oil pressure switch sensor:
http://www.realoem.com/bmw/enUS/show...diagId=11_3257
part number 12618611273