You might want to check out NAGCA.com. Other than the engines and a few front end parts, the XJ and ZJ are different beasts. I've had both, starting with a new Grand in '98, but now we have three XJs. The ZJ is something that most folks on here will not have had much experience with. Only '96 and newer XJs will resemble the electronics of a ZJ, as '96 is the intro of OBDII, and both vehicles finally shared much of the electronics.