******* UPDATE *********

I replaced the 6903 pump with a 4862 and added a regulator along with -6 braided line & AN fittings from the mechanical pump forward. Verified that the check valve was clear and added a small inline filter right in front of it. While the pump was off I inspected the pump pushrod. It looked perfect with both ends looking completely normal and it measured correctly.

All back together: Issue still looks the same at the gauge. I removed the brass filter from my summit carb feed line setup; no change. Strangely, I can’t get the pressure up over 6 psi no matter what I do with the regulator. I tried to attach a video to help, but apparently the file type my iPad creates is not uploadable.

Could this be just the guage? I had an issue on my last pass that really felt like fuel starvation. My sense is that the guage is correct, but it does bounce around a lot. ????