There's a NOS 540P at a
music store about an hour away from here that has the triple coil pickup. I have a 540P that was routed for one but came without the pickup. I have it loaded with a regular
bridge humbucker and a Chandler hot rails type pickup next to it. I don't know what the selections were. Whether it was series or parallel wired or switched between both. But I just use it as two seperates pickups. I routed mine for other pickups, too, so that's not the only pickup.
