'87 tank/fuel pump supplier

[dohc91gli]

old thread I know. but this is the setup I want to run, and I had a few questions. I see the 87 sender has 4 ports. one is pressure, one is return from the corvette regulator/filter. what are the other two for? I ask because instead of running a second complete tank/sender/pump, My thought was to simply (or not so simply) run a small transfer pump from the old talk to the new tank using one of those ports on the new sender. does anyone see a problem with doing this? I have twin tanks now, and originally I wanted to run two complete setups with new tanks, senders, and walbro 255's, but I was thinking this might work too, and cheaper.

second question, how does the walbro 255 hook up in the sender, anyone have a photo?

again, sorry to bump a year old thread. but since this had the info I needed, it seemed fitting.