Passenger side about half way up the transmission. Look just above the Dana 20 shift rails. Normally it is a square head plug but could be an allen head set screw.
No guarantee .... Just a possibility
[☠]lllllll[☠] 89 YJ ...SOA +6.5...44"Trxus'         I Love my dirtYJeep!  [☠]lllllll[☠]