what goes here? (head)

On my new motor there is a plug in this hole. on my 89' that is my daily driver it is used. does anyone know what screws in this hole? almost started the motor w/o it.
 

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yeah, that's where your oil sending unit mounts. Don't start the car w/o it, oil will come outta there real quick. On your n/a car it's got a sending unit threaded into the piece that goes into the head that your oil pressure gauge on your dash gets it's reading from.
 
yah, if it's got a plug in it yes. If it were a turbo car - then no, it's the oil supply for our turbo's.

Make sure you've got oil pressure, you may want to crank the motor over and see oil coming from the sending unit hole before putting the allen in and firing it up.