You should be able to buy a nylon threaded1"X3/4"barb fitting at Lowes or Tractor supply for your tank. On the outlet end after pump will probably have a 3/4" ball threaded valve cut off. After that install a 3/4" thread X 1/2" barb to accommodate your hose. Use pipe dope for your threads on nylon and tape on brass.
We all are merely gleaners from the masters who were here before us.