Thanks for the replies but I think I may have not been clear with my question.
All of the wires will connect to the rear of the switch which would be contained in a storage compartment and not the propane compartment. There is a partitioned wall between the two. The only part of the switch accessible in the propane compartment would be the on/off knob.
These switches are used in marine environments and are ignition protected for use in gasoline powered applications. I have contacted the manufacturer but have not heard back yet.
Blue Sea Switch