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We've seen more dead '87 and '88 XJs from this one connector than any other single cause. It is called the C-101 connector, and it connects the wires from the inside of the Jeep (i.e., computer, gauges, steering column) to the stuff under the hood (i.e., sensors and engine). It might have been a good idea when new, but grease, road dirt, water, and brittle plastic all contribute to bad connections between the stuff inside and the stuff outside. If you are looking at a Jeep of these years and it's got issues, look at the C-101 first.