tyre valve stem fitting

I have a compressor in my troopie. Its rigged to a bull bar tube air tank and an air outlet front and back. So far so good. I connect an air hose to this outlet and begin filling the tyre. Its only a little (ARB) compressor so this process takes some time. The gage thingie on the end of the air hose requires one to press the filling thingie firmly onto the valve stem. Ok for a few minutes but very tiring for any length of time.

My question now is: Is there an air hose fitting that can be threaded onto the valve stem to eliminate the 'pressing on' bit? It must be something that can be somehow connected to the metal tube of the inflator gauge thingie. If it exists, where would I get one in Perth?

I was thinking of machining one on my lathe but cutting such a fine internal thread is not easy and why reinvent it if it were already available?

Thanks,
Klaus