This is funny because we have all been here at some time. No disrespect intended. Orange tube w/wire- is oil pressure senders originating from the back of the block, under the distributor. Originally there would be one sender screwed into the block at this location. Yours has been modified to accept three different senders. #1- a mechanical gauge (the orange tube), #2- an original gauge (the large can w/wire), #3- an original idiot light (the small black unconnected one). You only need one which will be determined by which gauge you will use.
