You could have a parking brake switch and it will be located under the handle. There were several different styles of parking brake so you will have to root around and find the switch. The lamp itself is powered and all the switch does is ground the other side of the circuit. if you find the switch, groun dit and see if the light comes on. It may well not come on.
The 4WD switch and reverse switch can be reconnected but it can be a struggle to find th right connector. Have a look at whather you have the connectors.
BagusJeep lives in Bali.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE