Thats a new one on me as i have many of these units to keep up. If it is what you are describing then it is a pressure sensor for? As i don't think it is for ATM (auto trans) but i will remove one to see if it possibly linked to engine oil pressure. I am betting more on a barometric sensor if anything. Seen it but never questioned it as i have never had to fool with it. Thanks for the info!
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