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I read an older thread about ACT/ECT issues. A poster claimed using Teflon tape would cause a poor, or no ground at all, causing an ECT ACT open circuit. From what I can tell, (in my limited knowledge of wiring) neither of these sensors ground through the intake manifold, but through the computer. Is this correct?
 

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yes, hence why it has TWO wires.

oil press and water senders, ONE wire,,,,,,,,,,,,, ground through their housing.
 
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