My pop off gauge...

[powerslave]

So I bought this gauge for my carbs. Drag Specialties model. It has a female metal fitting at the end. Anyone have one of these and what size barb fitting I need to put a hose on the end of it?

 

[Sportster-2001-951C-Stock]

Sorry I don't recognize that one, is it a Schroeder valve fitting on the hose?

I keep a shoebox of fittings for my gear case pumps which I've had forever but still made today: