There should be on the left end of the tube assembly two small adjusting screws. One is for "out" and one is for "in" pressure. You will see a "+" and a "-" for each which corresponds to the pressure setting. You will need a ladder and an assistant inside the coach or the remote fob will make thing quicker to set. Good luck and let us know how thing turn out.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7