turn on vari and press and hold the +/- keys simultaneously for 3 secs , let go for a second then hold again for 3
It should bring up a flashing digit which is your current cut off setting, if you want ito cut it out at higher pressure change it up , and the opposite for a lower pressure
When done turn it off
When turned back on it will have the new setting
I tinkered about with mine last night and my setting is quite low 3/4 i think because it was ready to blow hoses off and wasnt cutting out