Gentlemen, haven't visited a Mustang forum in a few years, used to hang around Stangnet when I had a handful of stangs. I'm down to 1 now, a '67 coupe that will more than likely end up being a windsor 4 speed car. The reason I registered here is I went back to stangnet and the classic forum has pretty much died off. Seems to be a lot of movement in the newer threads but nothing for the real cars.

Anyway, today my issue is with my '66 F-100, I am doing a restomod and would like to install a Rally-pac, but I want to remove the tac,( I have the factory in dash tac already) and install an air pressure gauge for the air ride system. I was hoping someone could give me a few measurements to determine what diameter gauge might work? I know it will mount on the column as I had one on a previous '65