You gained .5 sec. with an AOD? Wow, unusual, considering your combination. Must have been easy on the clutch.
Anyway, the proper way to adjust your TV cable without the pressure gauges, is to remove the gromment from the TB, slide the white thing out so cable slides freely, make sure it is not binding, make sure the TB is closed all the way, and insert the gromment with no pressure on the cable, locking it into place.
U want the TV cable fully retracted when the TB is closed. This might not be the hardest shifting positon, but it is the longest tranny life position, and the best way without press gauges.
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1993 GT/AOD
'93 Mustang GT