P90 Pot
You use p90s is for their unique tone so you dont want to load them down or bleed them too much.
P90 pot. The entire casing of the pot should be grounded so theoretically you can ground any wire off of the switch by just running a jumper to the casing. There are even some wiring schematics around that make a 500k pot a 250k pot depending on the position of your five way blade so you have a 250k pot with. Buy soapbar p 90 guitar pickup harness pre wired with volume tone pots no soldering required. Or does it matter at all.
Also an ebay seller called solsound sells the switchcraft parts a little cheaper and the 22awg vintage wax cloth wire and the vintage braided gibson type wire can be found by the meter on ebay. The worlds largest selection of free guitar wiring diagrams. I recieved a very well matched set. I just bought the 550k custom taper cts pots from bkp for my guitar p90s.
Its an alnico 2 reportedly with a fatter warmer rounder more vintage tone so i chose to go with a500k pots to lend a little more brightness. Im putting together a guitar with a single p90 at the bridge. 23 delivered i think. Is there a consensu as to what value pots should be used with p90 soapbar or dogear pickups 500k or 250k ohms.
A popular way to get rid of some highs in your tone is to solder a 500k ohm resistor on your 500k ohm pot to effectively turn it into a 250k pot. When the push pull pot is pulled up the tap red on 3 conductor red and green tied together on 4 conductor is sent to ground shorting out the coil.