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I have been trying to sort out the mess of wiring left by a previous owner and somehow unhooked the temp sending unit. Can anyone tell me were the sending unit is and what color the wire might be on an 89' 4.2
 

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On my 94 2.5 the sending unit is a one wire plug/sensor on the drivers side rear of the head. Right next to the valve cover. Hopes this helps.
 
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