or make one? there is a GM brake res cap which will fit if you dont have an extra,(Mc PARTS) then as easy as adding a tire valve to it.
or like I did mine....w/ a gauge.
I tell ya these cars are a bear to bleed for some reason. I tried the one man jobber w/ the check valve on the end of a tube, the mity vac,etc, but the power bleeder is the way to go.