'95 Tahoe - Adding the factory keyless entry?

I'm exploring adding the factory keyless entry onto my Tahoe, I know I can snag the key fobs on ebay and a few online joints have them, but does anyone know what I have to do for the keyless entry module (reciever, or whatever it is called). Also is there a completely different interior wiring harness for the keyless entry equipped vehicles?

Any insight would be appreciated.

Thanks!

On the DLC (under the driver side dash) take and ground the G pin, to see if the door locks lock and unlock. I did this on mine and it had the keyless, then got a remote off of flea-bay, to program the remote ground G pin and the use the remote to lock/unlock, remove ground off of G pin and it should work. Maybe after market might save some $$$

I wonder if that would work on mine? ( See below.)

i picked up a keyless entry system on e-bay for under $30 took hour to install came with 2 key fobes works great. the remote does look gm however it opens the doors.