‘67 Barracuda vacuum gauge connection

Black Hose in a box marked Gates 27037 measured 0.245 o.d.
7/64 id (loose) for fittings designated 1/8" hose barbs.
Probably is what the box says but can't guarentee that.
This should work.

FWIW also have Gates 27075 box with orange silicone hose. Also 7/64 id. and 0.247 o.d.