‘67 Barracuda vacuum gauge connection

The silicone hose in that size will probably work if available in black. Still working on that possibilty.
In the meantime, I soaked the hose and the grommet in 3:1 solution of wintergreen oil and rubbing alcohol.
After a day or so the hose was much more flexible and the permanent set where it attached to the gage was gone.
So there's another option.
The grommet must have had other uses as well. Inside view.
upload_2020-6-17_16-17-6.png

upload_2020-6-17_16-19-41.png

upload_2020-6-17_16-20-43.png

The shine on the grommet is this cleaner/protector. Don't know that's its available. Not sure whats in it.
upload_2020-6-17_16-22-2.png

FWIW. Today I quickly remeasured the hose diameter using a vernier caliper and got 0.240"
That will pass through the grommet. Standard? washer/vac tube measured .267 (from Restoration Specialty Supply) and would not.
upload_2020-6-17_16-26-44.png