On the diesels, they're round, about 1.5" in diameter. Have you checked thoroughly around you're steering column and up under the dash.
Mine has one to the left of the steering column and another in the electrical bay where the trnas ECM is located.
Hope you find it. There should be plenty of American coach owners who have found it and can help.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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