Adding a door pad keyless entry?

[HERCULES-550]

I have keyless entry and am looking to add the door keypad to my truck. My remote is getting weak and sometimes would be nice to be able to leave keys in truck (at the beach or events). Has anyone added a keypad to their truck or know where I can get info on it?
Thanks

[ZMANN]

since you have the remote option I think this will work

http://www.soslock.com/services/auto...%2520flyer.pdf

if u didn't you would need to replace the GEM

[HERCULES-550]

Thanks. I called Ford $120 and it is just a stick on. I would like more permanant but this will work if that is all thats available.

[ZMANN]

I wonder if mine is just stuck on My 06 ??

I almost never use it because I arm my alarm through the Viper remote so it doesn't do Me any good unless I am locking the dog in the car for a minute and don't want the alarm armed