My oil pressure gauge hasn't worked since I've owned my 240, and I finally traced the problem to the pressure line to the gauge having been cut at the firewall!

There was evidence that the gauge had been leaking, so I'm assuming this is why the previous owner cut the line.
I would like to get it working again, but I have no clue where the pressure line attaches to the engine. Can anyone tell me, or even supply a pic maybe??