If you have an automatic transmission, there is an access pannel under the cupholder. I was sound deadning my truck so the pannel was easy to get to. Here it is removed.
There will be a little nipple sticking at the rear of the transmission. Pry the little metal cover off.
Attach a length of hose, and secure it with a hose clamp.
Run the hose wherever you choose. I ran mine to the engine compartment. Note that it is possible to do this without removing the pannel. I tried it, and it was possible, just much more difficult to see what you're doing.
Hope this helps.