actually the impedance for the sending units is the same from 79-87...in '88 Ford went to a different impedance reading-why '88? still don't know that one..
and the fuel pump is separate from the sending unit till '98 i think. I know all the fox tanks regardless of FI or carb have the sending unit in the middle, and the fuel pickup (or pump pickup/strainer ass'y for FI) off to the passenger side on the taller part of the tank
I could swear I seen my low fuel light come on quickly when I took a corner fast but it never came on again(91 GT) Either way im only gettin about 270kms to a tank which is costing me almost $50+ canadian to fill, I gotta scan for some codes, my check engine light comes on after about driving for 20 mins car is still fast very smooth just a pig on gas I guess.