On Mon, 7 Jun 2021 14:32:24 -0700, Bob F wrote:
You could even use a
reducer fitting where the plastic plug was on the pump, although that
may have readings that bounce around a lot when the pump is running.


Second thought. The one on the top might be better.

That makes the most sense to put a reducer bushing going from the top of the
pump 1 inch taper to a 3/8" straight to fit a new gauge on top of the pump.

Another good idea from you which I appreciate as I instantly agree.