Hmmmm. . . .
If you can't find it, then there probably is no tab for it. I just checked tabrobot.com, and it doesn't show anything for that song.
I know, it's a shame. I'm as pissed as you are. I'm a guitarist, and "obscure" music from the 60s is hard to find. "Plastic Fantastic Lover" is one of my favorite Airplane songs, but due to its limited appeal (it is, after all, mocking television and technology, right?), it is just another one of those songs that not enough people care about to warrant someone making a tab.
That's just how it is- you get a full tab of some crappy Green Day song the day it's released, but more then 35 years later, it's still hard to find tab for a lot of music (especially lesser-known bands) from the 60s.