I don't recall either what degree of influence you need, but just kill a few innocents, I suppose, and he'll probably give you the installation option. If you're really curious and can't wait (or still have no luck) use KSE and set influence to 75-100 (should be more than high enough at that point) and then go back into game and try again.
It's more of an ingame joke than anything. You take it out almost immediately.
Now, I want you to remember that no bastard ever won a war by dying for his country. He won it by making the other poor, dumb bastard die for his country.---Patton
There is no room in this country for hyphenated Americanism.---Teddy Roosevelt
I never forget a face, but in your case I'll make an exception.---Groucho
And if you all get killed, I'll piss on your graves.---Shaman Urdnot
How would you like to own a little bit of my foot in your ass.---Red Foreman