Oil Pressure sender nipple size & Thread size?

[dbdkemp]

without removing the oil pressure sender first to match the threads-
does anyone know what size the nipple and threads are on the oil pressure sender for a 87 300 SDL?
I believe the same sender was used for several years and models.

I need to put a Tee on a high pressure side to run to a centrifuge oil filter.
[U]http://www.dieselcraft.com/EngineOil.php/U]
This seemed like the likeliest point for me to run off from without disturbing the rest of the plumbing. figure i can get a brass tee fitting and a couple adapters to run the line.
I could just remove the sender and take it to match for sizes, but i would rather have the tee fittings and get it all done while changing the oil. measure twice cut once.
Thanks