Chris,
just go to Schucks and tell them you need a sender for a '72 mustang with a 351C. Bring the old one with you to compare. If you decide to do the "T" conversion, you can but the brass "T" fitting at Fastenal in Burien. I had a hard time finding them anywhere else. It is an easy mod.
Good luck and drop me a line if you need anything.
John
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