The wiring harness is available separately from the dealership & it includes, at least it did for my '97, a new windshield washer bottle & separate pump for the rear wiper. The harness itself is a fairly straight-forward installation & not difficult at all.
That said, I wouldn't bother buying the wiring harness. I can count the times I used the hard top's rear wiper on one hand over the years. Or maybe two fingers. Other than that, all you need are the six nuts & bolts to hold it to the rear of the tub & that's it.