In Reply to: Re: 860 Carb posted by Jack - Iowa on December 28, 2021 at 08:10:38:
Yep, they use 1/4" because it is convenient and a common size since that Ford gage listed does not exist anymore and I've never seen one and don't know of anyone ever having one. Dealer mechanics probably had one but most likely got lost or scrapped out when the dealer went under. Most likely not ID'd with a FORD logo and/or part/gage number. Here's a scan of the TISCO Carb Instruction Kit. Observe Page 9.
TISCO CARB C546V KIT FOR FORD N-SERIES MODELS INSTRUCTION SHEET: