Thanks for the addition! (:
Well first off I would recommend to check out of there is a centre block in your guitar or if it is completely hollow by just removing one pickup. (I guess it has got a centre block) And if there is a centre block you could consider routing the body to fit a p90. But if you want to go the easy way and not route your body for a p90 you could get a single coil that kind of sounds like a p90. (you can’t get something that exactly sounds like a p90 because it just is not a p90) Some single coils with p90 sounds are: The lace sensor purple, Harmonic Design Super 90, Rio Grande ‘Dirty Harry’ or the Lindy Fralin steel poled pickups but I would recommend that you do a little research yourself because there are more pickup manufacturers out there.
I hope it helps you a bit!
Awesome, I like classic tele’s!