Fuel Sending unit wiring

I have a 88 Mazda, I'm trying to wire in my 68 Mustang tank. I have 1 wire connection on the mustang tank. The Stock Mazda Harness has 3 wires. Anyone know which wire is what?

There is 2 black wires, One with a red stripe.

And then a single Yellow wire? (Cant remember fully its early.)

Any thoughts would help. Thanks