I switched from a 90 4cyl cluster to a v6 cluster from a 4runner at the junkyard.  Everything worked accept for the oil pressure indicator.  It is pegged all of the time on the new cluster. I figured the 4cyl didnt have a sender for a gauge with any range.  Just an idiot light. The only thing weird I had to do was turn the adjuster for the tach to be right.