Originally Posted by
Simon Barden
For standard humbuckers, having the adjustable screws facing the bridge (on the bridge pickup) and the neck (on the neck pickup) was merely an aesthetic consideration when Gibson started fitting them. They could easily have been fitted another way around and that would have become the accepted norm. here may be a very small variation in the sound due to slightly different responses from the individual coils in each pickup, but it really is minimal. They can be reversed and it wouldn't sound any different.
The Seymour Duncan P-Rails pups, on which these seem to have been roughly based, do have distinct bridge and neck pickup versions, where on the bridge pickup, the screws are by the bridge and the rail faces inwards, and no the neck, the screws face the neck and the rail faces inwards, with the SD logos both located in their standard place.
As one of the three coils on the Warmans is very different to the other two, there probably is going to be a more noticeable difference in the sound depending which way round they are orientated, especially in the bridge position when tapped. I'd leave sufficient cable so that they can be fit both ways round, and you simply try them out and find which orientation sounds best (probably easiest when in single coil mode).
With these Warmans, you need to remember that they are low-cost Asian made pups, and from the photos the Warman logo seems to be a sticky label, probably applied by hand. There doesn't appear from the website that there are specific neck and bridge versions of the pup, so I'm not surprised that they stick the label in the same place. There is one photo on the Warman site of a black version of the G-Rails with the adjustment screws in the bridge facing position and a printed (not a sticker) Warman logo, so it seems that they aren't that sure themselves!
I'd be very tempted to remove the Warman labels and fit them whichever way round you think is best.