I'm sure many of you know this already but for those who don't, if you're looking for an easy hole to run wires from the engine compartment into the cab look at the antenna. After removing the front passenger splash guard you'll find where the antenna wire enters the cab, there's enough room to run two 12 gauge wires through and they're easily retrieved by removing the glove box or just tilting it down.

 

Neat. Good to know!