Elephant Gun was annoying to work out as the original version is played on a uke tuned a semitone sharp (g#C#FA#). I decided to notate the chords as if the uke was in standard C-tuning. If you want to play along and don’t want to re-tune or use a capo, you can play along with this live version (or the many others on YouTube) which is in standard tuning.
To get the opening bars to sound right, start by strumming downwards twice, concentrating on the 3rd and 4th strings. Then strum upwards concentrating on the 1st and 2nd strings. Do this twice on the Am. Then, on the D7, strum in a similar way but hammering on from open strings on the first strum.
A quick aside, I’ve tweaked the tab (but not the chords) for Postcards from Italy. So if you grabbed it first time you might want to check back.