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Here's the latest: With new probe still installed, swapped connectors at back of gages. Now rear engine reads just fine (like front does when it's connected to front gage), and rear reading hotter than usual.
So I suspect that the gage or gage/probe combination is a little off. I looked around at the thing, including the gage cluster, but could see no adjustments to be made. I'm wondering if it's a matter of that old "set" of gage + probe that must match, etc. However I am suspicious of that.
Wonder if I could add some serial resistance to get the probe reading same as the front, but then would it read linearly, etc.? Wonder how they "match" the things?
Swapping the gage is a real pain, as removing that cluster and tearing into it is a lot of work and not very appealing.
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