get the kit and follow the directions
the connection you want in in front of the battery and the high side has a different connection so you can't connect to it
set the kit up and open the valve to let new R134A in and you will notice a difference right away. let it go for a minute then check the pressure with the guage and when it stays where it is suppose to stay you are all set
again just follow the package instructions and you should be fine
