The Ford Barn - View Single Post - What oil pressure sending unit 59AB in a 1941 Ford

drolston · 10-11-2022, 11:58 AM

Most new or NOS senders are 80 lb that started in 1942; they are all marked 80 on the base. You can still find the 50 lb senders, used. They are pretty reliable. If you find one that is not marked on the fitting on the underside, it is a 50 lb unit.

The 50 lb gauge on your '41 will still work with a 80 lb sender, just read 62.5% of the actual pressure. That is, if your engine is putting out an actual 40 psi, your gauge will read 25 psi. So it is somewhat better than an idiot lite.

If you haven't noticed yet, it is a bear to get to the sender to remove, install or hook up the wire with the engine in the car. You have to remove the whole floorboard and it is still a contortion act.

I bought a 4" copper nipple (pipe) and a female/female adapter from Ace Hardware to raise the oil sender up to a point where I could get to it within the engine compartment. If you do that and are removing or installing the engine, remember to remove the sender so the nipple does not get bent.

10-11-2022, 11:58 AM	#5
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,811	Re: What oil pressure sending unit 59AB in a 1941 Ford Most new or NOS senders are 80 lb that started in 1942; they are all marked 80 on the base. You can still find the 50 lb senders, used. They are pretty reliable. If you find one that is not marked on the fitting on the underside, it is a 50 lb unit. The 50 lb gauge on your '41 will still work with a 80 lb sender, just read 62.5% of the actual pressure. That is, if your engine is putting out an actual 40 psi, your gauge will read 25 psi. So it is somewhat better than an idiot lite. If you haven't noticed yet, it is a bear to get to the sender to remove, install or hook up the wire with the engine in the car. You have to remove the whole floorboard and it is still a contortion act. I bought a 4" copper nipple (pipe) and a female/female adapter from Ace Hardware to raise the oil sender up to a point where I could get to it within the engine compartment. If you do that and are removing or installing the engine, remember to remove the sender so the nipple does not get bent.