87 YJ, 4.2 block with 4.0 head using 91 YJ harness, the tach signal off the ecm will not work with non OBD1 tach, using C5 on the bulkhead to the tach I checked for continuity, then connected to the negitive side of the coil I am not getting my tach to work, tach worked before swap so I must not be getting positive power to the Tach, dose the tach positive feed off the bulkhead connector or the under dash fuse panel? also no power to the reverse lamps, are they related?
87 yj, no tach after 4.0 head swap
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