the harness to the dash or the harness to the message center???
what year is the message center coming off of?
if same year, get it, cuz you always can go to the junkyard and grab the harness...also, i called the ford dealership and they said that there are different message centers for different years....like my x is a 98, the message center is off a 95, it works, but not all of it like the average mph and miles driven, but it shows how many miles, gallons used and gallons left in the tank...also, check to see if your x was made in the early or late production of 98 (look on the side of the door), cuz the late models like mine, the lamp warning module has been deleted, and for the early production explorers and mountainers the lights are wired in series, so the lamp warning module would act like a jumper, so pretty much useless...
and yes, you would have to run your own lines for it there is no plug and play for FORD, the only thing that is plug and play is the factory fog lights, which i also put in with the platinum bumper, anyways....it takes 2 hours of wire harness prep work, about 10 hours of installation (running the wires thru), and it tooked me 10 hours of studying the cd rom...on where the wires go and crap. all in all, i say it is worth it, i like it, and it is helpful to know how many gallons and miles i have left.
any other questions on doing this mod, go ahead and ask, however, i also started a thread on it
"THIS IS HOW TO INSTALL A MESSAGE CENTER"
so check that out, it tells you what you need, sensors and stuff, what the wire colors are and where they go...
good luck...