Quick Question... (or series of questions)

I've got this Tokheim 65Gal lubester:


I want to put an old lubester sign I have (Gargoyle). The sign has a bolt hole in the tab.

1) Did the lubester signs mount on the calibration bolt?

2) Can this lubester even have a sign?

3) Won't it throw off the calibration to have a sign on there (This is a working Lubester).

That calibration bolt goes all the way down inside the pump cylinder... Who knows what would happen if I tried to take it out...

Thanks much,
Wes