Heres the fitting for my F/P guage and i think that that is the shrader valve in the back. Am I correct? The guage fitting is too big, should I just go buy an adapter?
pic is hard to see. is that a mechanical fp gauge? if so what size is the line? go buy a -3 or -4 AN fitting depending no what size the hose is. you need a 1/16 npt > -3AN fitting i would imagine