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A friend of mine just built one and it sounds great. Here's a link to some wiring help.
http://www.tdpri.com/forum/just-pickups ... p-90s.html

Filipo,

I am not sure exactly what you are looking for tonally, but here are some options that I have done or investigated (as one of my models comes stock with 3 P-90's).

For starters, I wanted my guitars to have the 3 90's, and the 5 way, but come with a very controllable tonal change between the selections. Therefore, I only used the pickups and the 5 way, and did not implement any additional series/ parallel or phase selections. I used a vintage wound matched set in the neck and middle positions, and a super overwound version in the bridge to help break it up if I wanted to. I wired it

Neck
neck/ middle
middle
middle / bridge
bridge

That gace me the tonal variation that I wanted - with just a standard volume and treble roll off control. I believe I use250K pots with a axially metalized 0.033uF cap. I might need tgo check on this, but I did considerable experimentation here and decided that I liked this pairing the best with the what the P-90 had to offer.

From there, you could go many different ways. Typically when you throw 2 single coil pickups together, their outputs are in parallel. With a push-pull, for examplre, you could switch from parallel to series (watch for the polarity of the outputs to prevent phase cancellation). Or, you could use a switch in modify the treble roll-off spectrum with additional capacitance.
There are really a lot of options, but in my personal opinions, I feel that sometimes players can get lost in the details, That being said, I have removed alot of such complexity from my guitars and have focused on doing the basics really well - standard treble roll controls....

Maybe this will help.
Stephen

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www.ziegenfussguitars.com

filippo, i'm with zieg here.
do those pickups have a coil tap?
or just 2 wires out?
you ca get a lot out of 3 pickups without a bunch of fancy wiring.
the pull pot could be used to put a pickup out of phase,
which is kind of cool.
nasal sound with less volume.
i don't use that much myself.
a

oh, something i discovered about a couple of years ago is,
oil filled tone caps.
i put them in my guitars now.
i think they make the git sound better.
more dynamic?
i don't know.
i never really do.
i just be tone monkey.

I'm beginning to think that I'm dealing with an out of phase pup, how do I correct that?

Try a 5 way switch and wire like a Strat with only 1 tone control.
Forget the out of phase and series options,way nasal or way way too powerful.
Have fun.

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How long is that in luthyears?