If you have a fuel pressure gauge I recommend testing the fuel pressure make sure the pressure isn’t to high. Usually that combination fixed the issue. I suppose it could be possible the new regulator failed.
Unfortunately the speaker is built into the instrument cluster. You would have to pull it and split it open. As far as tapping into the wiring for added indicators your best bet would be at the body control module. Everything in these modern vehicles runs off a network one computer talks to...
I would probably first check with my local dealer and see if they or any dealer still has the kit you can purchase. You will also want to replace the pressure regulator on the fuel rail as I think that was the main culprit.
Since the pickup in the distributor is new, and the ignition control module is new, I would be looking at the pcm. The spout circuit runs into it as well as a ground circuit from the pickup if I remember correctly