There is a steady drip off the oil pressure sending unit on the 84SD. It looks like the sending unit is 2 made from pieces crimped together. The FSM says this is an electric gauge. Is the leak likely to be at the crimp or where the electric connection screws in or at a gasket? Should I just pull the oil filter housing to be done? Is this a crawl in the gravel job or would a lift make it multiple times easier?

It looks like the valve cover gasket is going to leak (again). I'll follow these directions next.

http://www.peachparts.com/shopforum/diesel-discussion/328295-leak-free-617-a.html

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Despite the Crimp there must be some sort of Seal under there that the Crimp squashes because Oil Pressure Sending Units from other Cars sometimes leak in the same area.

However, there is a Crush Washer between the Sending Unit and the back Plate that it screws in to.

I have also read of the Back Plate being Cracked but that usually happes at the Turbo Line Banjo Bolt area.

On a W123 if it had the same type of Sending Unit you could get at it by putting the Left Front Wheel on a Ramp or Jack Stand assuming you are not fatter than Me. I am not sure on Your Chassis.

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84 300D, 82 Volvo 244Gl Diesel