Hi, Buicklady!
As far as I know, the coolant temperature sensor is located in the intake manifold. If you remove the air cleaner housing, it will be visible (maybe even visible with the air cleaner in place).
I'm not quite sure I understand what you are trying to do. Do you want to add an aftermarket temperature gauge? Or do you want to relocate your factory gauge to underneath the dash (not quite sure how that would work)?
-Bob C.
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