for the return to the tank, you need to either get a bulk head fitting and put it on the basket cover on top with a line that goes to the bottom of the tank or if you can spend the money get something like this
https://deatschwerks.com/collections...cts/9-000-7051 . Much cleaner setup, as drilling the bulkhead fitting is a pain in the ass and its very easy for it to leak. seems to me the center port would only be ideal for a returnless setup? Otherwise you would get slightly different fuel pressures acorss the injectors? Unless you have a return at either end like you said.
either way here is how I would do it, with your damper between the FPR and the guage a long with your sensor as close to the guage as possible. reuse the stock fuel lines going to and from as well. but I'm just a guy so ymmv lol
