There For Tomorrow - A Little Faster Intro Chords & Tabs

i miss the 'tapping' sound (i don't know how you guys call it) in the intro riff he 
in other tabs. I play it like this
[ Tab from: https://www.guitartabs.cc/tabs/t/there_for_tomorrow/a_little_faster_intro_tab.html ]
eb|--9-2h5-9/12-2-7p5-----|
Bb|-----------------------|
Gb|-----------------------|
Db|-----------------------| X3
Ab|-----------------------|
Db|-----------------------|

i play the first 9, the 9/12 part and the 7 from the 7p5 part with the indexfinger of my 
hand