The tuning for this is the E to be 
tuned down to D and the A to be 
Tuned down to G. So that’s E à D 
And A à G. 
I played this on acoustic and it sounds right, no idea what it will sound like on electric though.

Intro/ Verse
e|----------------------|
B|----------------------|
G|----------------------|
D|-10-------12----------|
A|-10-x12--12-x12-------|
E|--8--------10---------|

Chorus (about 12 times each it’s pretty easy to get the timing if you listen to the song)
      Go Steady with me
e|---------------------|
B|---------------------|
G|---------------------|
D|---------------------|
A|--888888888888-------|
E|--888888888888-------|

I know it turns you off when I 
e|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|--------------------------------|
A|--121212121212121212121212------|
E|--121212121212121212121212------|

I get talking like a teen 
e|------------------------|
B|------------------------|
G|------------------------|
D|------------------------|
A|--888888888888----------|
E|--888888888888----------|

I get talking like a teen
e|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|--------------------------------|
A|--121212121212121212121212------|
E|--121212121212121212121212------|

Bridge 
At the awesome part when Tegan sings “Hold on to me” I think Sara plays 
(I’m not to sure about this part but it sounds pretty much right)
e|--------------------------------------|
B|--------------------------------------|
G|--------------------------------------|
D|--------------------------------------|
A|--8888888888881212121210101010--------|
E|--8888888888881212121210101010--------|

Then Back To The Chorus

      Go Steady with me
e|------------------------|
B|------------------------|
G|------------------------|
D|------------------------|
A|--888888888888----------|
E|--888888888888----------|

I know it turns you off when I 
e|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|--------------------------------|
A|--121212121212121212121212------|
E|--121212121212121212121212------|

I get talking like a teen 
e|------------------------|
B|------------------------|
G|------------------------|
D|------------------------|
A|--888888888888----------|
E|--888888888888----------|

I get talking like a teen
e|----------------------------------|
B|----------------------------------|
G|----------------------------------|
D|----------------------------------|
A|--121212121212121212121212--------|
E|--121212121212121212121212--------|

Corrections are welcome, enjoy playing it’s an awesome song :]

Kimi