My favorite P-90 tones come from the bridge position. If you want a DD tone, the easiest way to get that is with a strat neck pu.
OK, recipe's it is.*
For a tele bridge pickup a good starting point would be IMO, you could try South polarity AlNiCo 3 or 5, 8,500 turns of AWG42 poly wound clockwise with moderate to heavy scatter. The heavier scatter will soften the resonant peak, and the slight overwind will lower it. Both of these combined will yield a pickup that is slightly mellower than a vintage 50's or 60's tone, and should blend well with a P-90.
On the P-90 at the neck. I would wind North up AlNiCo 5 CCW around 9,700 turns with a mild scatter. Be careful with the P-90 bobbins. If you use too much tension they will flare badly, and you won't be able to get the cover on. If the A5 is too harsh, try A2 magnets. This is a slight underwind which will make the pickup a little brighter.
Controls, and tone caps are going to make a very big difference, so be prepared to do some experimentation there.
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