Jeepin.com: XJ Gauge cluster swap
You're looking for plain old gauges or you're trying to do the white import look?
For regular gauges get a set from a junk yard, ebay, anywhere else you can find them. I just picked up a set off ebay for 40 shipped 2 weeks ago.
Buy new oil and coolant sending units that are for "gauges" rather than "lights" and simply swap everything out using the link above.
BTW, here's my thread from a few weeks ago with the part numbers for the 96.