Regulator settings with disposable propane tanks

Hey Guys!

I just changed my little torch around to have a disposable propane
tank with a regular oxygen tank with regulator. Does anyone know what
pressure I should be having the oxygen regulator set too to work with
the largest little torch tip (7 I think) with the disposable tank. I
know when having both gasses on regulators they should both be at
10psi - just not sure if having the disposable tank changes anything.

Thanks so much!
Lucy