Installing a 99 WJ Information Center into an XJ

How hard would it be to add and wire a "Information Center" (compass, thermometer, trip odometer, mpg display) from a 99 WJ into a 98 XJ? I guess I am hoping it would one of those "common wiring harness just not plugged in" type answers.

Thanks,
Sammer

Find an XJ overhead console from a 98+ XJ. They display the same types of things.