Davo
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I was just fiddling with this on my own '83 Rangie not long ago and yes, two ports are 1/2" UNF while the bigger one is indeed 9/16" UNF. The oil pressure sender and oil light switch are 1/2", and the oil temp is 9/16". Since they're not tapered threads, you do need some new copper joint washers as well. (I know this because I didn't have them!)
