Richard J Kinch wrote:

writes:

Does such a beast exist or am I going to have to build something up
with brass fittings?

A common gage will have 1/8 or 1/4 NPT male threads. You can step a 3/4
tee down to those.

Gages are pretty unreliable, especially when under pressure all the time.

???? A device designed specifically for the purpose is unreliable??? I
think the manufacturers would be somewhat surprised to hear that.