If you look at these two together, you can see what is expected.
Wire 34 (Batt) is the power coming in from the battery Wire 33 (Acc) is power out to things on the accessory line. Generally speaking, that is things that are powered in the run or acc position of the key. Wire 31 (Ign) is power out to things on the ignition line. Generally speaking, that is things that are powered in the start and run positions of the key.
If you are not adding extra stuff to the truck, your existing switch should be fine, but some measurements are needed.
Do you have a multimeter to see what terminals are connected in what key positions?
If you are adding a solenoid starter, you will need a new switch with a start position. In that case, hook up the wiring as shown in the documentation.
