[joe231]

all three are pink?
I assume you had dual tanks? You may need to trace out the wires to figure out which wire is which.
you will no longer need the wire to the switching valve, and I would disconnect the selector switch on the dash and pick one of the sending unit wires to use, the other isn't needed. I guess you could leave the switch and just pick a sending unit wire or hook them both up so your gauge would read the same regardless of the position of the selector switch.