81 gpz1100 - EFI - To keep or not to keep

Hi there, I’m about to do the same conversion, do you recall the size of the tap you used to tap the old petcock fitting and plug?

FYI, this is an old thread (2010), and Otakar has not logged in since December of last year, so you may not get a quick response unless McDroid knows the answer.
Didyou check Otakar’s build thread that he linked to? The answer may be there.