Far as I know it is normal tuning.
The tabs that are listed in rukind are correct. I have only checked this against multiple shows from 1977. I haven't checked any other years but it would be extemely irregular for them to use a different tuning especially just for one song.
Maybe I didn't understand your question.
"Everybody can dance if they want to, that means everybody...That means you all can dance if you want to, in fact its nicer, there's no point in watching us, we don't do anything we don't normally do." Jerry 01/17/68