It's hard to answer about the wiring repair without seeing the damage.
If there are no exposed connections or bare wires when attached, holding it with a tie wrap is usually more than satisfactory, and certainly much less expensive than replacing the entire manual lever position switch.
It is helpful to try to somewhat waterproof the connection by applying a large quantity of dielectric grease to the connectors before pushing them together. Heat should not be a factor for a tie wrap in that location.
