Is there something for this?

I have 2 compressors and 1 2 gallon tank with a port for just one compressor. Is there a way to use both compressors with the one port so it’ll fill up quicker?

that would be called a “T” fitting

HA HA sorry ^ agreed.

Go to your local tractor supply and get a 3 port manifold, its in the compressor section, then you will have two for each comp, and one for your horn.