Duh! - my old combo gauge
had the fittings (AN to NPT) plugged in the back---- only realized that as I was thinking of options. --
Just a matter of coupling the male-male NPT to hook up the senders.
Again, thanks for all the help.
Ron
Edit: -- Flyingcriki ----- yes, the adapter that Gearhead sold me is weird -- first two or three threads screw right into the female, but then tighten up --- if I need to use it, I will chase the threads -- thanks for the tip.