MOST come with a adapter that goes in between the filter and whatever you screw the filter into(its slipping my mind right now) Then the gauge hooks up to the adapter.

 

so it should go by the oil filter?

 

The sender. If its a oil pressure gauge. What does it look like? This thing should have can with instructions...

 

well i dont have any instructions for it but its just a wire hangin down by the oil filter and my oil pressure gauge isnt working and i tried looking under and finding where it plugs back into but i couldnt find anything by the oil pump. im just trying to plug this wire back in where it supposed to go