1) Since there are two pickups in a P bass, does it matter which goes on top and which on the bottom? 2) How do you measure the strength of the pickup with a multi-meter, what should it read and what does the reading mean? 3) Higher numbers stronger pickup but does this change alot from pickup to pickup? 4) Logically older instruments would have lower readings, does this affect the tone as well as the volume? 5) What should I be looking for if I buy a vintage (older) pickup? 6) How are most of you setting the heights of Precision pickups, yes I know with a screwdriver but how? Thanks!