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The head temp sensor, the speed sensor and the reference sensor all share a grommet. If the speed sensor and reference sensors are original (cracked insulation) replace them. I've seen several fail once they are that old. Replace the head temp sensor if it is the single wire kind (1 pin in the connector).
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
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