Simple switch the select inputs

[nbriles2000]

So I'm just finishing ordering parts for a preamp enclosure and I'm adding an extra input, but I have no idea what switch I need.

I read elsewhere that I need a DPDT switch to select between the two and I could tie the grounds together and all will be well. Is this correct?

I'm looking at this one specifically.
DPDT Mini Toggle Switch | 060-338

 

[DF96]

Yes, DPDT will switch between two stereo channels.