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Circuit Measurement

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Since you can't really mix and match gauges from the early cluster to the late cluster thanks to the printed circuit board on the back, we swapped the entire cluster in. We were told that the '87-'90 and '91-'95 water temp and oil pressure sending units were different. We found out that the '87 and '88 are different from the '89-and-up ones and confirmed it with our inside source at Jeep by comparing the part numbers in the Engine Bill of Materials book. In our case, the '89 sensors played fine with the '91 instrument cluster.