|The following is based on Fallout: New Vegas cut content and has not been confirmed by canon sources.|
Wrench is referred to multiple times in the G.E.C.K. and was meant to be involved in The White Wash. The Courier would be required to buy Wrench's super tool kit back from Miguel's Pawn Shop, and then return it to Wrench. The Courier would then need to ask Wrench what he knows about the water shortage, as can be found in VMS10 in the G.E.C.K. The script for The White Wash shows that Wrench can repair things, which would explain why the Courier needs to retrieve Wrench's super tool kit.
Wrench was cut from the final version of Fallout: New Vegas.