Didn't get no email. The oil line in the bell is the supply line running from the reservoir to the drive. You have a reservoir in the boat built into the port side of the transom plate. This is where you check the drive lube and add if needed. Should have a dipstick in it. It holds 1 quart and the TR drive holds 4 quarts.The valve on the bell and drive shut off the flow when the drive is removed. When drive is installed they open each other up so the lube can flow if needed from the reservoir. Should have had lube flowing out of the hose when you removed the bell if there was any in the reservoir. The wire is a ground wire. Connects to a screw on the gimble housing which is right in front of the lower swivel pin.

I believe with a long pair of snap ring pliers you can get the snap ring out and replace the tailstock bearing from outside.

What about that lower swivel pin, was that a bushing in the gimble ring or was the bearing missing? Maybe the rollers were missing? This seriously needs to be corrected.

I think the drive moving 3" side to side" is pretty much normal with cable steering when on the trailer.