The intro should be done using NATURAL HARMONICS like this.. 
 
 E|----12-----5----------------12------5----| 
 B|-12------5---------------12-------5------| 
 G|-------------12------------------------5-| 
 D|-----------------------------------------| 
 A|-----------------------------------------| 
 E|-----------------------------------------|

Basically, it follows the pattern C Am F G (all  E-form bar 
chords): 
 
C     Am     F  G 
Oh oh oh oh oh, you don`t have to go, ... 
 
repeated endless number of times, until: 
 
Am                         G 
When I read the letter you wrote me, ... 
 
which also repeats a few times before going back to the verse.

Electric Guitar: Main Rythm 
 
 E|-0--1---3---5---5---3----------------0--1--3---5---5--3-| 
 B|-1--3---5---5---5---4---3------------1--3--5---5---5--3-| 
 G|-0--2---4---5---5---4---4------------0--2--4---5---5--4-| 
 D|------------------------5-------------------------------| 
 A|--------------------------------------------------------| 
 E|--------------------------------------------------------|

Great tune! Here`s the main riff (as I figured out): 
 
   Cmaj7  Dmin7 Emin7   Fmaj7 Amin7 G   GII 
 e|-3-----5-----7-------8-----12-------7--| 
 B|-5-----6-----8-------10----13--12---8--| 
 G|-4-----5-----7-------9-----12--12---7--| 
 D|-5-----7-----9-------10----14--12---9--| 
 A|-3-----5-----7-------8-----12--10---10-| 
 E|---------------------------------------|

Intro to verses: (for intro to third verse, play the G majors 
as G minors) 
 
 E|-3---3-----------3---3------3---3-----------3---3-| 
 B|-3---3-----------3---3------3---3-----------3---3-| 
 G|-4---4---5-3-5---4---4------4---4---5-3-5---4---4-| 
 D|-5---5---5-3-5---5---5------5---5---5-3-5---5---5-| 
 A|-5---5---3-3-3---5---5------5---5---3-3-3---5---5-| 
 E|-3---3-----------3---3------3---3-----------3---3-|

Main Riff (Repeat as nessecery for verse) 
 
 e|-------------------------------------------------------------| 
 b|-------------------------------------------------------------| 
 g|-------------------------------------------------------------| 
 d|----------5b----------5b-----------5b----------5b-------7--5-| 
 a|-4--5--7--0--4--5--7--0---4--5--7--0--4--5--7--0--4--5--7--5-| 
 E|-0--0--0-----0--0--0------0--0--0-----0--0--0-----0--0--5--3-|

The intro/verse riff has three guitars, all standard tuning: 
 
guitar 1: 
 
 E|----------------------------| 
 B|----------------------------| 
 G|----------------------------| 
 D|-------/2--5b--------/2--5b-| 
 A|-4--5----------4--5---------| 
 E|----------------------------|