Ok, i'll try -string spacing refers to the fact that the bridge saddles spacing and nut width are different on Fender and Gibson (type) guitars therefore the distance apart the strings are is different.

To try and clarify, a fender has a longer scale and a narrower nut so imagine the strings pointing inwards at an angle -the further you go from the bridge to the nut the narrower the string spacing.

The Telecaster neck pickup is less wide than a standard Gibson neck pickup. The (important*) thing to remember is to get the measurement right so that the poll peices of the pickup sit as "squarely" as possible below the appropriate string (poll spacing).




[*Just to confuse things a lot of genuine Fender pickups all have the same poll spacing,but I don't agree with that concept.]