how to install outlet or switch box between 2 closely spaced wood studs?

[artie67]

Go to your local supplier and tell them what you are trying to do. Carm has linked the normal box for retro fitting a box between two studs. I like the metal ones, but plastic is code also. You might get a drywall saw also and do the wiring in the box before inserting into the wall.
Always make sure the breaker is OFF.