Standard tuning
You'll only need to use your D and A string! 
It's a simple powerchord w/ a occational pull.
It sounds good and you can sing the lyrics w/ it well.

E||--------------------------------------------- 
B||--------------------------------------------- 
G||--------------------------------------------- this riff loops
E||-------7-----5--3-33--5----5---7-------------  throughout
A||--0h3--5--0--3--1-11--3--0h3---5-------------   the song.
E||---------------------------------------------

I've always played it this way, i learn by ear and i can't
beleive this version isn't already on here. it sounds better
to me, and it's easier. 
From your Paramedic friend,  enjoy!!