mig regulator PSI questions

Hi Y'all,

I just bought a mig conversion kit for my lincoln weld pak 100. I weld just fine with flux core wire but its just too messy. I installed the kit in my welder. Super easy. Took less than 30 minutes. I bought an 80 cf argon/co2 mix cylinder new off evilbay. I will be getting it filled as soon as it comes in.
output

My question is what should my pressure regulator output be set at when i am welding. My conversion kit says consult my manual, but i have had this welder 15 plus years, and the manual is long gone.

Thanks in advance
Matt