642b engine temperature switch vs sender

oldwoodak

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Joined
Sep 18, 2021
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4
Hello,
I have a 1991 642B and I'm trying to figure out the function of engine temperature (coolant ?) switch (#15 in diagram); it is wired through the engine oil pressure sensor (#16)
to the warning light. Will the light go on if the coolant temp is too high? Could this switch be replaced with a sender for a temp gauge? Thanks
 

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