piece of cake with these kits. I will never have a sub on a game without one of these ever again.
http://www.pinnovators.com/catalog/
I used to wire in direct to the bass speaker in the bottom of the cab, which also works, but these kits are so much easier, and totally 100% reversible with no trace in case you sell the machine.
for met, you would use this one...
http://www.pinnovators.com/catalog/product_info.php?products_id=38&osCsid=l4cv53349s365db6e7job1cll2
note: I am in no way affiliated with pinnovators, I just love their products and their customer service is top notch.