I have put the Nordstrand P5 and the Nordstrand Bigsplit 5 in my 2012 P5. I used the 70's J bridge placement. The pickups are well matched in output. I used V/V/T for the controls and added a side jack. I used a mini 250K pot with .022mf cap for tone and did not have to route the control cavity.
I was after an aggressive "in your face" tone for a classic rock band and this bass delivers. It has it's own sound somewhere between a stingray and an 18v J deluxe.
I use mostly the J pup with a little of the P for more bottom. Lots of variation with the
two pups and with right hand placement.
Notes: I've had two of these basses and been unhappy with both. Bland non-P sound and B string that I could not intonate well with the bridge. I traded the first one quickly but this one has a great neck and I like the color. The Nordstrand P versus the stock P helped alot but things still were not right. I ended up moving the bridge back 5/32" and
get much better intonation and the super strong Nordstrand bridge got the sound.
I did this work myself.