Does anyone know how involved it would be to put keyless entry in my 1989 maxima I have access to a 1989 gxe that has keyless entry what parts from the donor car would I need to be able to add keyless entry to my 1989 se. I know that I need both door handles and I also know that I need to get the control box from behind the dash I need help if this is possible

 

definitely not worth the time and effort. It's about as much work as the climate control swap.
It'd be much easier to put in an aftermarket remote keyless entry and that's more useful too.
The only extra parts you'd really need are the keypads and beepers (right in the door next to the keypad) and of course the main unit. But then you'd have to run all new wiring for tons of things - into both front doors, to the sunroof, to the trunk, etc. There are two full pages of wiring in the FSM on this system and it's not simple.