Sounds like your oil pump (which drives the distributor) is a tooth off. Need to remove that, rotate in the desired direction, and re-stab it. That's how the Z24i is, and I assume the KA24 is the same in that regard.
You likely have two temp sensors. One is for the ECU and one is for the gauge. You can test the resistance of the sender according to the FSM to determine if it is good or not. More likely to be a connection, but a multi-meter will tell the tale.
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