If still functioning, might be able to use it to have some fun and make your jeep seem alive. Using it to detect people walking near the side of the jeep and have it hooked to set off a recording device with pre-recorded messages to go off, as if the jeep is talking to the people when they get near it.
" Hey, watch the paint, my owner just washed it!"
"I'm lost, can you tell me the way to the nearest Sand Dune?"
Just fun things to use it for, but save it, might be able to use it with any future alarm system you install if the system is equipped for extra sensor inputs.