Does anyone know where the oil temp sender plug is on my 96 wrx. i am trying to fit a spa oil temp/presure guage.

 

Try looking to the right hand side of the header tank, just infront of the turbo comp housing. It's a round nut (need allen key to take off) that's connected to the oil route to one cylinder. This is on a new age, but I'm sure classics are the same.