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No, you can't assume that. They are two separate gauge mechanisms in a common housing -- the work independently. You probably will not see any reading on the oil temp gauge until you've driven at sustained highway speeds for a while, so don't assume it isn't working either.
 

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Thinking back to my long-gone '67, I seem to remember the oil temp reading about mid-scale on the highway when the car still had the original B18 with factory oil/coolant heat exchanger. Then it got a B20 with no heat exchanger, and the gauge read lower. The gauge eventually went bad and always read very high -- two laps on a track day would send it off scale, so I may not be entirely clear on all this, but I think that's how it worked.
 
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