My solution to the dual tire inflating problem was to install the Croosfire tire equalization system. This has a unit mounted to the center hub that shows the air pressure in the tires visually. You order to unit with the tire pressure that you want to run. i run my rear tires on my 35un at 95 psi - there is a stem on the unit that you add air to and this inflates both tires at the same time and keeps them both at the same psi.
So just walking by the rear tires I can glance down and see the pressure in both tires simultaneously. By the way the system will close down an air leak from one of the stainless air lines to either tire so that both tires won't deflate due to a leak.
Watch this video -
https://youtu.be/GqqRdtFTdLE