So recently I came across this hole (after the original oil change) in the front of the engine and underway I noticed about a tablespoon of engine oil coming out of it. I have since changed and flushed the engine 3 times and added a remote drain and hose to the front of engine, previously the prior owners sucked the oil out od dipstick hole and could not get all of the oil out so the oil has been black as coal, and who knows what gunk may be in there, (the reason for the flushing) so changing the filters each flush and added 1 pint of diesel each for the first two flushes @ 30 seconds running and the last just oil then draind and refilled. so currently trying to upload a pic, hopefully. The picture of the preasure sending unit is another question I have. Previous owners mover the sending unit from under the starter, I think the oval thing to the left in pic is preasure alarm sensor? the black hose on right is open ended for what purpose I don't know. there were a few other mods I have been addressing, such as another temp sending unit installed where the block drain is supposed to be additional to the one at thermstat housing, and oh yes only about a pint of antifreeze drained out of the block when I removed the sensor, fortunatly didn't crack the block or blow a head gasket when bringing it home. Thank you for any thoughts you all may have. Ray..