air pressure guage

[fifty]

The EV2 air pressure gauge (R17266)....Can you tell me what size air line goes into the back of this gauge? Is it a push fit or threaded with ferrule?

I am running a air line from my extremeaire magnum and tank to it. I believe the air line is DOT reinforced air brake hose type b 3/8 inch OD (well that is what it says on the outside of the line)
Looks like this:
Air Brake Tubing, Type B, 3/8 In OD, Blk - Air Brake Tubing - Automotive Mechanical - 2ZJW4 : Grainger Industrial Supply

Need to figure out if i need a part to convert it to the gauge. Any ideas?

Thanks