What kit is that anyway?
Are you still running the stock FPR? They probably intended for it to be mounted like this kit:
http://www.roadraceengineering.com/instructions/bm-fprgaugeinstructions.htm
With an aftermarket FPR, which doesn't sit on the fuel rail, the sender would bolt down into the top of a threaded banjo bolt.
As for buying a "T", what are you going to do about the stock FPR? (I'm assuming that's what you're using.) The banjo is part of the FPR. So, just adding a "T" won't remedy the situation.
EDIT: If you are still using the stock FPR and still running with the FPD (Fuel Pressure Damper), I think your best bet would be to have a machine shop drill and tap a new port on the fuel rail. I could be wrong though, there might be something much simpler that I'm missing.