someones concoction for a oil pressure light and and a gauge, if you want to keep it, split it apart and clean and seal the threads, not sure why they put a shut off valve in there tho.
https://www.quadratec.com/p/omix-ada/door-lock-cylinder-kit-76-90-jeep-cj-cherokee-xj-wrangler-yj Or you can use the newer lock style with the double-sided key, just be careful as not all are the same size,